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Heading West -Meet the Pioneers At The Oregon Trail Interpretive Center in Baker City
A fun day at the Oregon Trail Interpretive Center, exploring the Oregon Trail history, and watching living history performers and guest musicians during the annual Heading West Wagon Encampment
The National Historic Oregon Trail Interpretive Center sits high atop Flagstaff Hill outside Baker City Oregon, overlooking the ruts of the Oregon Trail still visible today in the Baker valley below. Located along the Hells Canyon Scenic Byway, an outdoor wagon encampment is the first sights visitors see when they arrive at the National Historic Oregon Trail Interpretive Center.
Costumed narrators from the Trail Tenders provide interpretation and narration for the exhibits and activities throughout the center. For more information about the Oregon Trail Interpretive Center including a list of upcoming events and activities visit www.blm.gov/or/oregontrail
For more information about other Baker County heritage sites, attractions and museums, visit the Baker County Tourism website at www.travelbakercounty.com or become a fan at www.facebook.com/travelbakercounty
The Lotus in the recently restocked pond are doing well at the Jerusalem Botanical Gardens.
The water was muddy, so sepia & cyan tools were utilized in Topaz.
Panasonic G1, Lumix G Vario 45-200... a great weekend for all.
This photo was taken at Long Lake in Southern Yukon. I converted the photo to B&W using Lightroom. Then I exported the B&W version and a colour version for combination in Photoshop. The result is neither full colour nor monochrome but something unique which feels true to the original scene. I hope you like it.
At the Oregon Trail Interpretive Center in Baker City with Buffalo Bill Boycott and Dr Jo
A fun day at the Oregon Trail Interpretive Center, in Baker City Oregon exploring the Oregon Trail, pioneer and gold rush history. The Center recently reopened with new Covid 19 precautions in place including social distancing and mask requirements, and redesigned interpretive experiences.
Buffalo Bill Boycott’s performance is just one of numerous annual visiting musical performances including this summer’s new “After Hours on the Oregon Trail” outdoor concert series
The National Historic Oregon Trail Interpretive Center sits high atop Flagstaff Hill outside Baker City Oregon, overlooking the ruts of the Oregon Trail still visible today in the Baker valley below. Located along the Hells Canyon Scenic Byway, an outdoor wagon encampment is the first sights visitors see when they arrive at the National Historic Oregon Trail Interpretive Center.
Costumed narrators from the BLM staff and Trail Tenders volunteer group provide interpretation and narration for the exhibits and activities throughout the center. For more information about the Oregon Trail Interpretive Center including a list of upcoming events and activities visit www.blm.gov/or/oregontrail
For more information about other Baker County heritage sites, attractions and museums, visit the Baker County Tourism website at www.travelbakercounty.com or become a fan at www.facebook.com/travelbakercounty
Brooklands Museum Trust Ltd operates the independent Brooklands Museum as a charitable trust and a private limited company incorporated on 12 March 1987; its aim is to conserve, protect and interpret the unique heritage of the Brooklands site.
The museum is located south of Weybridge, Surrey and was first opened regularly in 1991 on 30 acres (120,000 m2) of the original 1907 motor-racing circuit. It includes four Listed buildings: the 1907 Brooklands Automobile Racing Club Clubhouse and Members' Hill Restaurant buildings, the 1911 Flight Ticket Office, and a 1940 Bellman aircraft hangar. Surviving sections of the 1937 Campbell Circuit, the 1907 Finishing Straight and Members' Banking (the steepest section of the former racing circuit), the 1909 Test Hill, and a WW2 'Bofors' gun tower are all important parts of the Brooklands Scheduled Monument which was extended in 2002. The entire Brooklands site was designated a Conservation Area by Surrey County Council in 1989. The Brooklands Trust Members, formed in 2008 after the Friends of Brooklands Museum and the Brooklands Club amalgamated, and is the official supporters' organisation for the Museum.
Vue dans l'exposition du centre d’interprétation du Lieu historique national de Red Bay, Labrador, Canada.
L’affiche rappelle que suite à la découverte et de l’étude de l’épave du navire San Juan coulé près de l'île Saddle, un projet de reconstruction a été entrepris à Albaloa, la Faktoria Maritime Basque, à Pasoa, en Espagne. J'ai pu en faire la visite à l'été 2019 mon dernier voyage avant la pandémie!
Baptisée « Baie Rouge » par les Français au 16e siècle (les Basques, nommaient l'endroit le port Butus), Red Bay était une station baleinière basque. À l’époque, la prolifération de baleines franches et de baleines boréales a attiré les baleiniers de la région basque d’Espagne et de la France dans le détroit de Belle-Isle à Red Bay où ils ont établi cet important poste de chasse. En effet, la baie à proprement parler est protégée de l'océan Atlantique par l'île Saddle, ce qui en fait un port naturel idéal.
Cette île, de même que l’île Penney, fut utilisée par les Basques pour leurs opérations de découpage des baleines et de la fonte de leur graisse. Ainsi, pendant quelque 70 années, les baleiniers basques ont entrepris ce dangereux périple d’un mois, traversant l’Atlantique pour chasser les baleines et produire l’huile qui éclairait les lampes en Europe. Ce site archéologique terrestre et sous-marin (découverte de plusieurs épaves de bateaux datant des années 1550-1600 dont le San Juan) est aujourd’hui considéré comme l’un des plus anciens complexes industriels du Nouveau Monde, lui valant d’être classé au patrimoine mondial de l’UNESCO en 2013 (WHL-1412).
Oregon or Bust Wagon Encampment in Baker City Oregon
A fun Labor Day weekend at the Oregon Trail Interpretive Center’s “Oregon Or Bust” wagon encampment, exploring the Oregon Trail history, and watching living history performers and guest musicians. This annual wagon encampment held each Labor Day weekend typically takes place at the Oregon trail Interpretive Center but was moved to Baker City’s Geiser Pollman Park this year since the Center remains closed due to COVID.
The National Historic Oregon Trail Interpretive Center sits high atop Flagstaff Hill outside Baker City Oregon, overlooking the ruts of the Oregon Trail still visible today in the Baker valley below. Located along the Hells Canyon Scenic Byway, an outdoor wagon encampment is the first sights visitors see when they arrive at the National Historic Oregon Trail Interpretive Center.
Costumed narrators from the Trail Tenders, and BLM staff provide interpretation and narration for the exhibits and activities throughout the center. For more information about the Oregon Trail Interpretive Center including a list of upcoming events and activities visit www.blm.gov/or/oregontrail
For more information about other Baker County heritage sites, attractions and museums, visit the Baker County Tourism website at www.travelbakercounty.com.
Meet the Pioneers at the Oregon Trail Interpretive Center in Baker City
Labor Day Weekend Wagon Encampment at the Oregon Trail Interpretive Center.
The National Historic Oregon Trail Interpretive Center on Flagstaff Hill outside Baker City Oregon. A pioneer wagon encampment is the first thing that visitors see when arriving at this award winning and world class interpretive center. The entire facility is staffed with costumed interpreters helping visitors discover the Oregon trail and the experiences of early pioneers as they made their way West during the nation’s largest overland migration. The Interpretive Center hosts numerous special events and activities throughout the year including, Dutch oven cooking demonstrations, lectures, and hands on gold panning demonstrations.
The National Historic Oregon Trail Interpretive Center, operated by the Bureau of Land Management, is located 5 miles east of Baker City, Oregon on Highway 86. Take Exit 302 from I-84. The Center is open from 9 a.m. to 6 p.m. daily. Admission for adults is $8. Seniors are $4.50. Children 15 and under are free. Federal passes are accepted. Visit www.oregontrail.blm.gov for more information about the Center, or call 541-523-1843
For more information about other Baker County historic sites, attractions and special events, visit the Baker County tourism website at www.basecampbaker.com
Crosskirk Broch was a fortification near the present day hamlet of Crosskirk near Thurso, Caithness, Scotland. After thorough archaeological exploration it was destroyed in 1972 since the site had become unsafe due to sea erosion. The site was unusual in having a broch, a large circular fortification, built within an older promontory fortification with a ring wall and blockhouse.
Crosskirk was occupied at the end of the Bronze Age. From the early Iron Age that followed there is carinated pottery that appears to be locally made but is similar to pottery of the same period in southern and eastern England. A few samples are black-burnished. Uncorrected radiocarbon dates for this pottery are in the 6th and 5th centuries BC. There seems to be a discontinuity in the middle Iron Age when the buildings were reconstructed and new types of pottery and artifacts were introduced, although variants of some of the older styles continued. This may be interpreted as being due to the influx of some influential new population.
Further use of local pottery continued into the period of Roman occupation of the south of Scotland in 80-180 AD. There were also remains of Roman pottery and glassware that may have been Roman in origin. A body was buried in a sitting position in the middle of an approximately circular building around the time that the site was abandoned. No grave goods were found.
There are traces of two long cist burials in the debris of the broch from some time around 600 AD. There used to be a stone with a runic inscription at Crosskirk, now lost, dating from the period of the Norse raiders in the 9th, 10th and 11th centuries. St Mary's Chapel (Crosskirk), built around the 13th century and now ruined, is about 30 yards (27 m) south of the site. Some of the land south of the broch was levelled when St Mary's was built. In recent times, some of the stones from the broch mound were removed, perhaps for building field dykes.
The promontory fort predated the broch, which was built inside the older structure. The earlier structure was an outwork that began at the edge of the promontory in the east, a 15 feet (4.6 m) thick wall or rampart of rock with an earth core. A gateway that widened towards the outside provided access through the wall. To the west of the gateway the rampart included a structure like a cell, and then there was a recess in the inner face of the wall. The outwork continued west, ending in a fence made of flagstones that reached to the cliff edge at Chapel Geo.
Based on radiocarbon dates, the broch was built around 200 BC, and was still in use in the second century AD. The broch would have given an impression of great strength, rising above the existing defensive wall. It included a guard cell, an intramural chamber and a stair entrance at ground level. Although the wall of the broch was relatively thick, it was poorly built, with a core of earth, rubble and boulders. This may be interpreted as being an early, experimental broch design. The roundhouse was not built strongly enough to support a tower more than 4.5 metres (15 ft), half the height of later towers.
There were external buildings around the tower that are thought to have been a village, an arrangement found only in northern Scotland.[8] These houses were occupied from about the same time as the broch was completed. During the next two centuries there were a series of changes and repairs to the broch, but they could not overcome its underlying weakness of design, and by the end of that period it would have been in poor shape. During the same period, house enclosures of the settlement outside the broch but within the rampart were steadily added and improved. A final phase of occupation and construction took place in the 2nd century AD, when the broch was rehabilitated before being finally abandoned. During this last period it seems that there was no defensive concern
The main crop was barley. Samples found at Crosskirk and Bu also include the seeds of other plants such as fat hen, sorrel and chick weed. This mix was probably deliberate, since the other seeds have medical and nutritional value. Cattle and some sheep were raised, and were supported through the winters. The people ate shellfish, particularly limpets, winkles and whelks, and ate seabirds. At nearby locations there is evidence of deep sea fishing for plaice and cod, and of consumption of venison. The evidence shows that the community had an ample and varied diet, and was largely self-sufficient.
An 1871 description of the broch said it
has an internal diameter of approximately 30 to 32ft and a wall 14 to 15ft thick. It has been broken into from the S, where there appears to have been an entrance to the left of which the sides of a chamber are visible in the wall. At the edge of the cliff, some 20ft of wall about 4 to 5ft high is exposed. On the landward side about 10ft from the broch are the remains of an outer bank or wall, now some 8ft wide at the base.
A report in 1964 said the broch was visible as a circular enclosure, covered in grass, with the wall no more than 1.1 metres (3 ft 7 in) high on the inside, and no more than 1.5 metres (4 ft 11 in) high on the exterior. The cliff edge had eroded, partly exposing traces of the north of the wall. There was a shallow depression around the broch and a low bank on the southwest side that may have been the remains of the outer defense wall. Coastal erosion was undercutting the cliff, making the site unsafe. Between 1966 and 1972 Fairhurst and Taylor excavated the ruin. The remains of the broch were then pushed over the cliff by a bulldozer, the site grassed over, and a memorial cairn erected.
The Highlands is a historical region of Scotland. Culturally, the Highlands and the Lowlands diverged from the Late Middle Ages into the modern period, when Lowland Scots language replaced Scottish Gaelic throughout most of the Lowlands. The term is also used for the area north and west of the Highland Boundary Fault, although the exact boundaries are not clearly defined, particularly to the east. The Great Glen divides the Grampian Mountains to the southeast from the Northwest Highlands. The Scottish Gaelic name of A' Ghàidhealtachd literally means "the place of the Gaels" and traditionally, from a Gaelic-speaking point of view, includes both the Western Isles and the Highlands.
The area is very sparsely populated, with many mountain ranges dominating the region, and includes the highest mountain in the British Isles, Ben Nevis. During the 18th and early 19th centuries the population of the Highlands rose to around 300,000, but from c. 1841 and for the next 160 years, the natural increase in population was exceeded by emigration (mostly to Canada, the United States, Australia and New Zealand, and migration to the industrial cities of Scotland and England.) and passim The area is now one of the most sparsely populated in Europe. At 9.1/km2 (24/sq mi) in 2012, the population density in the Highlands and Islands is less than one seventh of Scotland's as a whole.
The Highland Council is the administrative body for much of the Highlands, with its administrative centre at Inverness. However, the Highlands also includes parts of the council areas of Aberdeenshire, Angus, Argyll and Bute, Moray, North Ayrshire, Perth and Kinross, Stirling and West Dunbartonshire.
The Scottish Highlands is the only area in the British Isles to have the taiga biome as it features concentrated populations of Scots pine forest: see Caledonian Forest. It is the most mountainous part of the United Kingdom.
Between the 15th century and the mid-20th century, the area differed from most of the Lowlands in terms of language. In Scottish Gaelic, the region is known as the Gàidhealtachd, because it was traditionally the Gaelic-speaking part of Scotland, although the language is now largely confined to The Hebrides. The terms are sometimes used interchangeably but have different meanings in their respective languages. Scottish English (in its Highland form) is the predominant language of the area today, though Highland English has been influenced by Gaelic speech to a significant extent. Historically, the "Highland line" distinguished the two Scottish cultures. While the Highland line broadly followed the geography of the Grampians in the south, it continued in the north, cutting off the north-eastern areas, that is Eastern Caithness, Orkney and Shetland, from the more Gaelic Highlands and Hebrides.
Historically, the major social unit of the Highlands was the clan. Scottish kings, particularly James VI, saw clans as a challenge to their authority; the Highlands was seen by many as a lawless region. The Scots of the Lowlands viewed the Highlanders as backward and more "Irish". The Highlands were seen as the overspill of Gaelic Ireland. They made this distinction by separating Germanic "Scots" English and the Gaelic by renaming it "Erse" a play on Eire. Following the Union of the Crowns, James VI had the military strength to back up any attempts to impose some control. The result was, in 1609, the Statutes of Iona which started the process of integrating clan leaders into Scottish society. The gradual changes continued into the 19th century, as clan chiefs thought of themselves less as patriarchal leaders of their people and more as commercial landlords. The first effect on the clansmen who were their tenants was the change to rents being payable in money rather than in kind. Later, rents were increased as Highland landowners sought to increase their income. This was followed, mostly in the period 1760–1850, by agricultural improvement that often (particularly in the Western Highlands) involved clearance of the population to make way for large scale sheep farms. Displaced tenants were set up in crofting communities in the process. The crofts were intended not to provide all the needs of their occupiers; they were expected to work in other industries such as kelping and fishing. Crofters came to rely substantially on seasonal migrant work, particularly in the Lowlands. This gave impetus to the learning of English, which was seen by many rural Gaelic speakers to be the essential "language of work".
Older historiography attributes the collapse of the clan system to the aftermath of the Jacobite risings. This is now thought less influential by historians. Following the Jacobite rising of 1745 the British government enacted a series of laws to try to suppress the clan system, including bans on the bearing of arms and the wearing of tartan, and limitations on the activities of the Scottish Episcopal Church. Most of this legislation was repealed by the end of the 18th century as the Jacobite threat subsided. There was soon a rehabilitation of Highland culture. Tartan was adopted for Highland regiments in the British Army, which poor Highlanders joined in large numbers in the era of the Revolutionary and Napoleonic Wars (1790–1815). Tartan had largely been abandoned by the ordinary people of the region, but in the 1820s, tartan and the kilt were adopted by members of the social elite, not just in Scotland, but across Europe. The international craze for tartan, and for idealising a romanticised Highlands, was set off by the Ossian cycle, and further popularised by the works of Walter Scott. His "staging" of the visit of King George IV to Scotland in 1822 and the king's wearing of tartan resulted in a massive upsurge in demand for kilts and tartans that could not be met by the Scottish woollen industry. Individual clan tartans were largely designated in this period and they became a major symbol of Scottish identity. This "Highlandism", by which all of Scotland was identified with the culture of the Highlands, was cemented by Queen Victoria's interest in the country, her adoption of Balmoral as a major royal retreat, and her interest in "tartenry".
Recurrent famine affected the Highlands for much of its history, with significant instances as late as 1817 in the Eastern Highlands and the early 1850s in the West. Over the 18th century, the region had developed a trade of black cattle into Lowland markets, and this was balanced by imports of meal into the area. There was a critical reliance on this trade to provide sufficient food, and it is seen as an essential prerequisite for the population growth that started in the 18th century. Most of the Highlands, particularly in the North and West was short of the arable land that was essential for the mixed, run rig based, communal farming that existed before agricultural improvement was introduced into the region.[a] Between the 1760s and the 1830s there was a substantial trade in unlicensed whisky that had been distilled in the Highlands. Lowland distillers (who were not able to avoid the heavy taxation of this product) complained that Highland whisky made up more than half the market. The development of the cattle trade is taken as evidence that the pre-improvement Highlands was not an immutable system, but did exploit the economic opportunities that came its way. The illicit whisky trade demonstrates the entrepreneurial ability of the peasant classes.
Agricultural improvement reached the Highlands mostly over the period 1760 to 1850. Agricultural advisors, factors, land surveyors and others educated in the thinking of Adam Smith were keen to put into practice the new ideas taught in Scottish universities. Highland landowners, many of whom were burdened with chronic debts, were generally receptive to the advice they offered and keen to increase the income from their land. In the East and South the resulting change was similar to that in the Lowlands, with the creation of larger farms with single tenants, enclosure of the old run rig fields, introduction of new crops (such as turnips), land drainage and, as a consequence of all this, eviction, as part of the Highland clearances, of many tenants and cottars. Some of those cleared found employment on the new, larger farms, others moved to the accessible towns of the Lowlands.
In the West and North, evicted tenants were usually given tenancies in newly created crofting communities, while their former holdings were converted into large sheep farms. Sheep farmers could pay substantially higher rents than the run rig farmers and were much less prone to falling into arrears. Each croft was limited in size so that the tenants would have to find work elsewhere. The major alternatives were fishing and the kelp industry. Landlords took control of the kelp shores, deducting the wages earned by their tenants from the rent due and retaining the large profits that could be earned at the high prices paid for the processed product during the Napoleonic wars.
When the Napoleonic wars finished in 1815, the Highland industries were affected by the return to a peacetime economy. The price of black cattle fell, nearly halving between 1810 and the 1830s. Kelp prices had peaked in 1810, but reduced from £9 a ton in 1823 to £3 13s 4d a ton in 1828. Wool prices were also badly affected. This worsened the financial problems of debt-encumbered landlords. Then, in 1846, potato blight arrived in the Highlands, wiping out the essential subsistence crop for the overcrowded crofting communities. As the famine struck, the government made clear to landlords that it was their responsibility to provide famine relief for their tenants. The result of the economic downturn had been that a large proportion of Highland estates were sold in the first half of the 19th century. T M Devine points out that in the region most affected by the potato famine, by 1846, 70 per cent of the landowners were new purchasers who had not owned Highland property before 1800. More landlords were obliged to sell due to the cost of famine relief. Those who were protected from the worst of the crisis were those with extensive rental income from sheep farms. Government loans were made available for drainage works, road building and other improvements and many crofters became temporary migrants – taking work in the Lowlands. When the potato famine ceased in 1856, this established a pattern of more extensive working away from the Highlands.
The unequal concentration of land ownership remained an emotional and controversial subject, of enormous importance to the Highland economy, and eventually became a cornerstone of liberal radicalism. The poor crofters were politically powerless, and many of them turned to religion. They embraced the popularly oriented, fervently evangelical Presbyterian revival after 1800. Most joined the breakaway "Free Church" after 1843. This evangelical movement was led by lay preachers who themselves came from the lower strata, and whose preaching was implicitly critical of the established order. The religious change energised the crofters and separated them from the landlords; it helped prepare them for their successful and violent challenge to the landlords in the 1880s through the Highland Land League. Violence erupted, starting on the Isle of Skye, when Highland landlords cleared their lands for sheep and deer parks. It was quietened when the government stepped in, passing the Crofters' Holdings (Scotland) Act, 1886 to reduce rents, guarantee fixity of tenure, and break up large estates to provide crofts for the homeless. This contrasted with the Irish Land War underway at the same time, where the Irish were intensely politicised through roots in Irish nationalism, while political dimensions were limited. In 1885 three Independent Crofter candidates were elected to Parliament, which listened to their pleas. The results included explicit security for the Scottish smallholders in the "crofting counties"; the legal right to bequeath tenancies to descendants; and the creation of a Crofting Commission. The Crofters as a political movement faded away by 1892, and the Liberal Party gained their votes.
Today, the Highlands are the largest of Scotland's whisky producing regions; the relevant area runs from Orkney to the Isle of Arran in the south and includes the northern isles and much of Inner and Outer Hebrides, Argyll, Stirlingshire, Arran, as well as sections of Perthshire and Aberdeenshire. (Other sources treat The Islands, except Islay, as a separate whisky producing region.) This massive area has over 30 distilleries, or 47 when the Islands sub-region is included in the count. According to one source, the top five are The Macallan, Glenfiddich, Aberlour, Glenfarclas and Balvenie. While Speyside is geographically within the Highlands, that region is specified as distinct in terms of whisky productions. Speyside single malt whiskies are produced by about 50 distilleries.
According to Visit Scotland, Highlands whisky is "fruity, sweet, spicy, malty". Another review states that Northern Highlands single malt is "sweet and full-bodied", the Eastern Highlands and Southern Highlands whiskies tend to be "lighter in texture" while the distilleries in the Western Highlands produce single malts with a "much peatier influence".
The Scottish Reformation achieved partial success in the Highlands. Roman Catholicism remained strong in some areas, owing to remote locations and the efforts of Franciscan missionaries from Ireland, who regularly came to celebrate Mass. There remain significant Catholic strongholds within the Highlands and Islands such as Moidart and Morar on the mainland and South Uist and Barra in the southern Outer Hebrides. The remoteness of the region and the lack of a Gaelic-speaking clergy undermined the missionary efforts of the established church. The later 18th century saw somewhat greater success, owing to the efforts of the SSPCK missionaries and to the disruption of traditional society after the Battle of Culloden in 1746. In the 19th century, the evangelical Free Churches, which were more accepting of Gaelic language and culture, grew rapidly, appealing much more strongly than did the established church.
For the most part, however, the Highlands are considered predominantly Protestant, belonging to the Church of Scotland. In contrast to the Catholic southern islands, the northern Outer Hebrides islands (Lewis, Harris and North Uist) have an exceptionally high proportion of their population belonging to the Protestant Free Church of Scotland or the Free Presbyterian Church of Scotland. The Outer Hebrides have been described as the last bastion of Calvinism in Britain and the Sabbath remains widely observed. Inverness and the surrounding area has a majority Protestant population, with most locals belonging to either The Kirk or the Free Church of Scotland. The church maintains a noticeable presence within the area, with church attendance notably higher than in other parts of Scotland. Religion continues to play an important role in Highland culture, with Sabbath observance still widely practised, particularly in the Hebrides.
In traditional Scottish geography, the Highlands refers to that part of Scotland north-west of the Highland Boundary Fault, which crosses mainland Scotland in a near-straight line from Helensburgh to Stonehaven. However the flat coastal lands that occupy parts of the counties of Nairnshire, Morayshire, Banffshire and Aberdeenshire are often excluded as they do not share the distinctive geographical and cultural features of the rest of the Highlands. The north-east of Caithness, as well as Orkney and Shetland, are also often excluded from the Highlands, although the Hebrides are usually included. The Highland area, as so defined, differed from the Lowlands in language and tradition, having preserved Gaelic speech and customs centuries after the anglicisation of the latter; this led to a growing perception of a divide, with the cultural distinction between Highlander and Lowlander first noted towards the end of the 14th century. In Aberdeenshire, the boundary between the Highlands and the Lowlands is not well defined. There is a stone beside the A93 road near the village of Dinnet on Royal Deeside which states 'You are now in the Highlands', although there are areas of Highland character to the east of this point.
A much wider definition of the Highlands is that used by the Scotch whisky industry. Highland single malts are produced at distilleries north of an imaginary line between Dundee and Greenock, thus including all of Aberdeenshire and Angus.
Inverness is regarded as the Capital of the Highlands, although less so in the Highland parts of Aberdeenshire, Angus, Perthshire and Stirlingshire which look more to Aberdeen, Dundee, Perth, and Stirling as their commercial centres.
The Highland Council area, created as one of the local government regions of Scotland, has been a unitary council area since 1996. The council area excludes a large area of the southern and eastern Highlands, and the Western Isles, but includes Caithness. Highlands is sometimes used, however, as a name for the council area, as in the former Highlands and Islands Fire and Rescue Service. Northern is also used to refer to the area, as in the former Northern Constabulary. These former bodies both covered the Highland council area and the island council areas of Orkney, Shetland and the Western Isles.
Much of the Highlands area overlaps the Highlands and Islands area. An electoral region called Highlands and Islands is used in elections to the Scottish Parliament: this area includes Orkney and Shetland, as well as the Highland Council local government area, the Western Isles and most of the Argyll and Bute and Moray local government areas. Highlands and Islands has, however, different meanings in different contexts. It means Highland (the local government area), Orkney, Shetland, and the Western Isles in Highlands and Islands Fire and Rescue Service. Northern, as in Northern Constabulary, refers to the same area as that covered by the fire and rescue service.
There have been trackways from the Lowlands to the Highlands since prehistoric times. Many traverse the Mounth, a spur of mountainous land that extends from the higher inland range to the North Sea slightly north of Stonehaven. The most well-known and historically important trackways are the Causey Mounth, Elsick Mounth, Cryne Corse Mounth and Cairnamounth.
Although most of the Highlands is geographically on the British mainland, it is somewhat less accessible than the rest of Britain; thus most UK couriers categorise it separately, alongside Northern Ireland, the Isle of Man, and other offshore islands. They thus charge additional fees for delivery to the Highlands, or exclude the area entirely. While the physical remoteness from the largest population centres inevitably leads to higher transit cost, there is confusion and consternation over the scale of the fees charged and the effectiveness of their communication, and the use of the word Mainland in their justification. Since the charges are often based on postcode areas, many far less remote areas, including some which are traditionally considered part of the lowlands, are also subject to these charges. Royal Mail is the only delivery network bound by a Universal Service Obligation to charge a uniform tariff across the UK. This, however, applies only to mail items and not larger packages which are dealt with by its Parcelforce division.
The Highlands lie to the north and west of the Highland Boundary Fault, which runs from Arran to Stonehaven. This part of Scotland is largely composed of ancient rocks from the Cambrian and Precambrian periods which were uplifted during the later Caledonian Orogeny. Smaller formations of Lewisian gneiss in the northwest are up to 3 billion years old. The overlying rocks of the Torridon Sandstone form mountains in the Torridon Hills such as Liathach and Beinn Eighe in Wester Ross.
These foundations are interspersed with many igneous intrusions of a more recent age, the remnants of which have formed mountain massifs such as the Cairngorms and the Cuillin of Skye. A significant exception to the above are the fossil-bearing beds of Old Red Sandstone found principally along the Moray Firth coast and partially down the Highland Boundary Fault. The Jurassic beds found in isolated locations on Skye and Applecross reflect the complex underlying geology. They are the original source of much North Sea oil. The Great Glen is formed along a transform fault which divides the Grampian Mountains to the southeast from the Northwest Highlands.
The entire region was covered by ice sheets during the Pleistocene ice ages, save perhaps for a few nunataks. The complex geomorphology includes incised valleys and lochs carved by the action of mountain streams and ice, and a topography of irregularly distributed mountains whose summits have similar heights above sea-level, but whose bases depend upon the amount of denudation to which the plateau has been subjected in various places.
Climate
The region is much warmer than other areas at similar latitudes (such as Kamchatka in Russia, or Labrador in Canada) because of the Gulf Stream making it cool, damp and temperate. The Köppen climate classification is "Cfb" at low altitudes, then becoming "Cfc", "Dfc" and "ET" at higher altitudes.
Places of interest
An Teallach
Aonach Mòr (Nevis Range ski centre)
Arrochar Alps
Balmoral Castle
Balquhidder
Battlefield of Culloden
Beinn Alligin
Beinn Eighe
Ben Cruachan hydro-electric power station
Ben Lomond
Ben Macdui (second highest mountain in Scotland and UK)
Ben Nevis (highest mountain in Scotland and UK)
Cairngorms National Park
Cairngorm Ski centre near Aviemore
Cairngorm Mountains
Caledonian Canal
Cape Wrath
Carrick Castle
Castle Stalker
Castle Tioram
Chanonry Point
Conic Hill
Culloden Moor
Dunadd
Duart Castle
Durness
Eilean Donan
Fingal's Cave (Staffa)
Fort George
Glen Coe
Glen Etive
Glen Kinglas
Glen Lyon
Glen Orchy
Glenshee Ski Centre
Glen Shiel
Glen Spean
Glenfinnan (and its railway station and viaduct)
Grampian Mountains
Hebrides
Highland Folk Museum – The first open-air museum in the UK.
Highland Wildlife Park
Inveraray Castle
Inveraray Jail
Inverness Castle
Inverewe Garden
Iona Abbey
Isle of Staffa
Kilchurn Castle
Kilmartin Glen
Liathach
Lecht Ski Centre
Loch Alsh
Loch Ard
Loch Awe
Loch Assynt
Loch Earn
Loch Etive
Loch Fyne
Loch Goil
Loch Katrine
Loch Leven
Loch Linnhe
Loch Lochy
Loch Lomond
Loch Lomond and the Trossachs National Park
Loch Lubnaig
Loch Maree
Loch Morar
Loch Morlich
Loch Ness
Loch Nevis
Loch Rannoch
Loch Tay
Lochranza
Luss
Meall a' Bhuiridh (Glencoe Ski Centre)
Scottish Sea Life Sanctuary at Loch Creran
Rannoch Moor
Red Cuillin
Rest and Be Thankful stretch of A83
River Carron, Wester Ross
River Spey
River Tay
Ross and Cromarty
Smoo Cave
Stob Coire a' Chàirn
Stac Polly
Strathspey Railway
Sutherland
Tor Castle
Torridon Hills
Urquhart Castle
West Highland Line (scenic railway)
West Highland Way (Long-distance footpath)
Wester Ross
ore 14.16 [prima considerazione]
Non prendo caffè. Da sempre. Ci ho provato una volta sola. Ho rischiato di farmi arrivare il cuore in gola. I battiti erano aumentati spropositatamente. Non ho più ripetuto l'impresa. L'avevo fatto perchè volevo sentirmi più grande, avere il piacere di sentire il sapore del caffè nella bocca. Avevo poco più di 13 anni. Ora mi piace osservare chi lo prende. Quali reazioni e motivazioni ci sono dietro ad una tazzina di caffè. L'odore è la cosa che più mi piace, soprattutto dopo pranzo. C'è gente che lo prende di corsa, alla mattina, appena alzata, o piano, perchè senza non potrebbe iniziare bene la giornata. Altri che lo prendono al bar, allo stesso bar, ogni giorno, svogliatamente, pensando alle cose da fare o al nulla. Altri ancora che lo preparano con meticolosità, aspettando che esca la cremina prima di tutto. Ma ci sono anche quelli che ne devono prendere meno del solito, che si devono limitare. Io amo la categoria del piano perchè senza non potrebbero fare bene. Sono quelli che invidio di più.
ore 14.19 [seconda considerazione, all'aperto tra me e lui]
"Ridi eh? Che fai mi prendi in giro perchè io non lo posso bere?"
"No rido perchè mi guardi con un fare sospettoso, per caso vuoi fare una fotografia?"
"Per caso, sì. Oggi c'è un bel sole, abbiamo questa fantastica opportunità di rilassarci per qualche minuto, di godere della natura. Per caso, mi è venuta voglia di immortalare questo momento. Non tutti possono permettersi una roba del genere..."
"Ok, ma solo qualche scatto. Ho voglia di bere il caffè prima che si raffreddi"
Sorrido e corro via a prendere la macchinetta fotografica, prima che finisca l'incantesimo.
Postings to the Themed Alphabets group during the "Interpreted letters II" theme
a. mag3737, b. Eva the Weaver, c. TooFarNorth, d. Eva the Weaver, e. mag3737, f. cutesmallfuzzy, g. Eva the Weaver, h. mag3737, i. Eva the Weaver, j. cutesmallfuzzy, k. biggertree, l. Eva the Weaver, m. biggertree, n. mag3737, o. cutesmallfuzzy, p. TooFarNorth, q. Eva the Weaver, r. tmooney74, s. mag3737, t. tmooney74, u. Eva the Weaver, v. tmooney74, w. biggertree, x. urbanmkr, y. mag3737, z. biggertree
Created with fd's Flickr Toys.
interpreti:
Daniela Marretti, Irene Paoletti, Luca Pierini,
Enrica Pistolesi, Cosimo Postiglione, Mirio Tozzini
Musiche, clarinetto e voce:
Francesco Melani
ideazione della performance:
Daniela Marretti
regia:
Mario Fraschetti
Un po' di lomografia con biottica e rullino 220 colori scaduto 15 anni fa. I tagli non perfettamente quadrati sono dovuti al taglio 'creativo' del laboratorio e agli errori di spaziatura del negativo della Yashica Mat 124G
At the California Trail Center in Elko, Nevada you will have the opportunity to experience multimedia exhibits, life size dioramas, original art, and video productions. You can hike the trails, attend interpretive programs, and speak with knowledgeable staff.
Postings to the Themed Alphabets group during the "interpreted letters" theme.
a. mag3737, b. Claudecf, c. mag3737, d. Claudecf, e. Xurble, f. mag3737, g. Claudecf, h. urbanmkr, i. Claudecf, j. Leo Reynolds, k. urbanmkr, l. Claudecf, m. Xurble, n. urbanmkr, o. T Squircle, p. Claudecf, q. urbanmkr, r. mag3737, s. Claudecf, t. mag3737, u. Claudecf, v. mag3737, w. nastylittleman, x. Claudecf, y. urbanmkr, z. Monceau
Created with fd's Flickr Toys.
Gracias a la vida» es una popular canción de inspiración folclórica chilena compuesta e interpretada por la cantautora Violeta Parra (1917-1967), una de las artistas que sentó las bases del movimiento artístico conocido como la Nueva Canción Chilena.
La canción abre su álbum Las últimas composiciones (1966), el último publicado por Violeta antes de su suicidio, ocurrido el 5 de febrero de 1967
En reiteradas ocasiones, esta canción ha sido considerada una de las más importantes de la música chilena y se le ha calificado como un «himno humanista», obteniendo el permanente reconocimiento de la crítica y el público como una obra profundamente humana y universal, más allá de su popularidad transversal.
Gracias a la vida» es una de las canciones chilenas más conocidas e interpretadas en el mundo, y permanentemente está incluida en antologías de canciones latinoamericanas.
La versión interpretada en 1971 por la cantante argentina Mercedes Sosa en el disco Homenaje a Violeta Parra difundió la canción a nivel internacional dentro del mundo hispanohablante.
Por otro lado, la legendaria cantante folk Joan Báez popularizó la canción en los Estados Unidos en 1974 al incluir una versión de la canción en su álbum del mismo nombre con canciones en español.
La cantante finlandesa Arja Saijonmaa grabó esta canción en finlandés (Miten voi kyllin kittää) y en sueco (Jag vill tacka livet) junto con Inti-Illimani, siendo esta última una de las interpretaciones más populares en ese idioma.
GRANDES ESTRELLAS: En 2010, y luego del terremoto que afectó a Chile, el cantante Beto Cuevas realizó una nueva edición de la famosa canción con estrellas mundiales tales como Miguel Bosé, Alejandro Sanz, Shakira, Fher, Juanes, Laura Pausini y Michael Bublé.
Voces unidas por Chile youtu.be/_7-vTDV_aSA youtu.be/_7-vTDV_aSA
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OS DEJO EL ENLACE POR SI NO FUNCIONA EL VIDEO EN LA PÁGINA,
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Oregon or Bust Wagon Encampment in Baker City Oregon
A fun Labor Day weekend at the Oregon Trail Interpretive Center’s “Oregon Or Bust” wagon encampment, exploring the Oregon Trail history, and watching living history performers and guest musicians. This annual wagon encampment held each Labor Day weekend typically takes place at the Oregon trail Interpretive Center but was moved to Baker City’s Geiser Pollman Park this year since the Center remains closed due to COVID.
The National Historic Oregon Trail Interpretive Center sits high atop Flagstaff Hill outside Baker City Oregon, overlooking the ruts of the Oregon Trail still visible today in the Baker valley below. Located along the Hells Canyon Scenic Byway, an outdoor wagon encampment is the first sights visitors see when they arrive at the National Historic Oregon Trail Interpretive Center.
Costumed narrators from the Trail Tenders, and BLM staff provide interpretation and narration for the exhibits and activities throughout the center. For more information about the Oregon Trail Interpretive Center including a list of upcoming events and activities visit www.blm.gov/or/oregontrail
For more information about other Baker County heritage sites, attractions and museums, visit the Baker County Tourism website at www.travelbakercounty.com.
Interpretive sign at the restored Lilac Park at the southeast corner of the Hwy 7 / Co Rd 25 interchange on Hwy 100.
Oeuvre réalisée lors d'un symposium de sculpture en plein air.
Le symposium de Sprimont est conçu comme une rencontre de sculpture, et non un concours. L’objectif est de permettre aux artistes internationaux confirmés de travailler ensemble dans une ambiance conviviale, tout en bénéficiant d’un maximum de moyens techniques. Afin de garantir la qualité des œuvres produites, les candidats doivent cependant présenter leur travail ainsi qu’un avant-projet afin d’être sélectionnés par un jury.
Depuis 1994, le symposium de sculpture a lieu chaque année à la fin de l’été.
Work created during an open-air sculpture symposium.
The Sprimont symposium is designed as a sculpture meeting, not a competition. The aim is to allow established international artists to work together in a friendly atmosphere, while benefiting from maximum technical resources. In order to guarantee the quality of the works produced, candidates must however present their work as well as a preliminary project in order to be selected by a jury.
Since 1994, the sculpture symposium has taken place every year at the end of the summer.
IR HDR. Pikes Peak in the background. IR converted Canon Rebel XTi. AEB +/-2 total of 3 exposures processed with Photomatix.
High Dynamic Range (HDR)
High-dynamic-range imaging (HDRI) is a high dynamic range (HDR) technique used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present a similar range of luminance to that experienced through the human visual system. The human eye, through adaptation of the iris and other methods, adjusts constantly to adapt to a broad range of luminance present in the environment. The brain continuously interprets this information so that a viewer can see in a wide range of light conditions.
HDR images can represent a greater range of luminance levels than can be achieved using more 'traditional' methods, such as many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. This is often achieved by capturing and then combining several different, narrower range, exposures of the same subject matter. Non-HDR cameras take photographs with a limited exposure range, referred to as LDR, resulting in the loss of detail in highlights or shadows.
The two primary types of HDR images are computer renderings and images resulting from merging multiple low-dynamic-range (LDR) or standard-dynamic-range (SDR) photographs. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor.
Due to the limitations of printing and display contrast, the extended luminosity range of an HDR image has to be compressed to be made visible. The method of rendering an HDR image to a standard monitor or printing device is called tone mapping. This method reduces the overall contrast of an HDR image to facilitate display on devices or printouts with lower dynamic range, and can be applied to produce images with preserved local contrast (or exaggerated for artistic effect).
In photography, dynamic range is measured in exposure value (EV) differences (known as stops). An increase of one EV, or 'one stop', represents a doubling of the amount of light. Conversely, a decrease of one EV represents a halving of the amount of light. Therefore, revealing detail in the darkest of shadows requires high exposures, while preserving detail in very bright situations requires very low exposures. Most cameras cannot provide this range of exposure values within a single exposure, due to their low dynamic range. High-dynamic-range photographs are generally achieved by capturing multiple standard-exposure images, often using exposure bracketing, and then later merging them into a single HDR image, usually within a photo manipulation program). Digital images are often encoded in a camera's raw image format, because 8-bit JPEG encoding does not offer a wide enough range of values to allow fine transitions (and regarding HDR, later introduces undesirable effects due to lossy compression).
Any camera that allows manual exposure control can make images for HDR work, although one equipped with auto exposure bracketing (AEB) is far better suited. Images from film cameras are less suitable as they often must first be digitized, so that they can later be processed using software HDR methods.
In most imaging devices, the degree of exposure to light applied to the active element (be it film or CCD) can be altered in one of two ways: by either increasing/decreasing the size of the aperture or by increasing/decreasing the time of each exposure. Exposure variation in an HDR set is only done by altering the exposure time and not the aperture size; this is because altering the aperture size also affects the depth of field and so the resultant multiple images would be quite different, preventing their final combination into a single HDR image.
An important limitation for HDR photography is that any movement between successive images will impede or prevent success in combining them afterwards. Also, as one must create several images (often three or five and sometimes more) to obtain the desired luminance range, such a full 'set' of images takes extra time. HDR photographers have developed calculation methods and techniques to partially overcome these problems, but the use of a sturdy tripod is, at least, advised.
Some cameras have an auto exposure bracketing (AEB) feature with a far greater dynamic range than others, from the 3 EV of the Canon EOS 40D, to the 18 EV of the Canon EOS-1D Mark II. As the popularity of this imaging method grows, several camera manufactures are now offering built-in HDR features. For example, the Pentax K-7 DSLR has an HDR mode that captures an HDR image and outputs (only) a tone mapped JPEG file. The Canon PowerShot G12, Canon PowerShot S95 and Canon PowerShot S100 offer similar features in a smaller format.. Nikon's approach is called 'Active D-Lighting' which applies exposure compensation and tone mapping to the image as it comes from the sensor, with the accent being on retaing a realistic effect . Some smartphones provide HDR modes, and most mobile platforms have apps that provide HDR picture taking.
Camera characteristics such as gamma curves, sensor resolution, noise, photometric calibration and color calibration affect resulting high-dynamic-range images.
Color film negatives and slides consist of multiple film layers that respond to light differently. As a consequence, transparent originals (especially positive slides) feature a very high dynamic range
Tone mapping
Tone mapping reduces the dynamic range, or contrast ratio, of an entire image while retaining localized contrast. Although it is a distinct operation, tone mapping is often applied to HDRI files by the same software package.
Several software applications are available on the PC, Mac and Linux platforms for producing HDR files and tone mapped images. Notable titles include
Adobe Photoshop
Aurora HDR
Dynamic Photo HDR
HDR Efex Pro
HDR PhotoStudio
Luminance HDR
MagicRaw
Oloneo PhotoEngine
Photomatix Pro
PTGui
Information stored in high-dynamic-range images typically corresponds to the physical values of luminance or radiance that can be observed in the real world. This is different from traditional digital images, which represent colors as they should appear on a monitor or a paper print. Therefore, HDR image formats are often called scene-referred, in contrast to traditional digital images, which are device-referred or output-referred. Furthermore, traditional images are usually encoded for the human visual system (maximizing the visual information stored in the fixed number of bits), which is usually called gamma encoding or gamma correction. The values stored for HDR images are often gamma compressed (power law) or logarithmically encoded, or floating-point linear values, since fixed-point linear encodings are increasingly inefficient over higher dynamic ranges.
HDR images often don't use fixed ranges per color channel—other than traditional images—to represent many more colors over a much wider dynamic range. For that purpose, they don't use integer values to represent the single color channels (e.g., 0-255 in an 8 bit per pixel interval for red, green and blue) but instead use a floating point representation. Common are 16-bit (half precision) or 32-bit floating point numbers to represent HDR pixels. However, when the appropriate transfer function is used, HDR pixels for some applications can be represented with a color depth that has as few as 10–12 bits for luminance and 8 bits for chrominance without introducing any visible quantization artifacts.
History of HDR photography
The idea of using several exposures to adequately reproduce a too-extreme range of luminance was pioneered as early as the 1850s by Gustave Le Gray to render seascapes showing both the sky and the sea. Such rendering was impossible at the time using standard methods, as the luminosity range was too extreme. Le Gray used one negative for the sky, and another one with a longer exposure for the sea, and combined the two into one picture in positive.
Mid 20th century
Manual tone mapping was accomplished by dodging and burning – selectively increasing or decreasing the exposure of regions of the photograph to yield better tonality reproduction. This was effective because the dynamic range of the negative is significantly higher than would be available on the finished positive paper print when that is exposed via the negative in a uniform manner. An excellent example is the photograph Schweitzer at the Lamp by W. Eugene Smith, from his 1954 photo essay A Man of Mercy on Dr. Albert Schweitzer and his humanitarian work in French Equatorial Africa. The image took 5 days to reproduce the tonal range of the scene, which ranges from a bright lamp (relative to the scene) to a dark shadow.
Ansel Adams elevated dodging and burning to an art form. Many of his famous prints were manipulated in the darkroom with these two methods. Adams wrote a comprehensive book on producing prints called The Print, which prominently features dodging and burning, in the context of his Zone System.
With the advent of color photography, tone mapping in the darkroom was no longer possible due to the specific timing needed during the developing process of color film. Photographers looked to film manufacturers to design new film stocks with improved response, or continued to shoot in black and white to use tone mapping methods.
Color film capable of directly recording high-dynamic-range images was developed by Charles Wyckoff and EG&G "in the course of a contract with the Department of the Air Force". This XR film had three emulsion layers, an upper layer having an ASA speed rating of 400, a middle layer with an intermediate rating, and a lower layer with an ASA rating of 0.004. The film was processed in a manner similar to color films, and each layer produced a different color. The dynamic range of this extended range film has been estimated as 1:108. It has been used to photograph nuclear explosions, for astronomical photography, for spectrographic research, and for medical imaging. Wyckoff's detailed pictures of nuclear explosions appeared on the cover of Life magazine in the mid-1950s.
Late 20th century
Georges Cornuéjols and licensees of his patents (Brdi, Hymatom) introduced the principle of HDR video image, in 1986, by interposing a matricial LCD screen in front of the camera's image sensor, increasing the sensors dynamic by five stops. The concept of neighborhood tone mapping was applied to video cameras by a group from the Technion in Israel led by Dr. Oliver Hilsenrath and Prof. Y.Y.Zeevi who filed for a patent on this concept in 1988.
In February and April 1990, Georges Cornuéjols introduced the first real-time HDR camera that combined two images captured by a sensor3435 or simultaneously3637 by two sensors of the camera. This process is known as bracketing used for a video stream.
In 1991, the first commercial video camera was introduced that performed real-time capturing of multiple images with different exposures, and producing an HDR video image, by Hymatom, licensee of Georges Cornuéjols.
Also in 1991, Georges Cornuéjols introduced the HDR+ image principle by non-linear accumulation of images to increase the sensitivity of the camera: for low-light environments, several successive images are accumulated, thus increasing the signal to noise ratio.
In 1993, another commercial medical camera producing an HDR video image, by the Technion.
Modern HDR imaging uses a completely different approach, based on making a high-dynamic-range luminance or light map using only global image operations (across the entire image), and then tone mapping the result. Global HDR was first introduced in 19931 resulting in a mathematical theory of differently exposed pictures of the same subject matter that was published in 1995 by Steve Mann and Rosalind Picard.
On October 28, 1998, Ben Sarao created one of the first nighttime HDR+G (High Dynamic Range + Graphic image)of STS-95 on the launch pad at NASA's Kennedy Space Center. It consisted of four film images of the shuttle at night that were digitally composited with additional digital graphic elements. The image was first exhibited at NASA Headquarters Great Hall, Washington DC in 1999 and then published in Hasselblad Forum, Issue 3 1993, Volume 35 ISSN 0282-5449.
The advent of consumer digital cameras produced a new demand for HDR imaging to improve the light response of digital camera sensors, which had a much smaller dynamic range than film. Steve Mann developed and patented the global-HDR method for producing digital images having extended dynamic range at the MIT Media Laboratory. Mann's method involved a two-step procedure: (1) generate one floating point image array by global-only image operations (operations that affect all pixels identically, without regard to their local neighborhoods); and then (2) convert this image array, using local neighborhood processing (tone-remapping, etc.), into an HDR image. The image array generated by the first step of Mann's process is called a lightspace image, lightspace picture, or radiance map. Another benefit of global-HDR imaging is that it provides access to the intermediate light or radiance map, which has been used for computer vision, and other image processing operations.
21st century
In 2005, Adobe Systems introduced several new features in Photoshop CS2 including Merge to HDR, 32 bit floating point image support, and HDR tone mapping.
On June 30, 2016, Microsoft added support for the digital compositing of HDR images to Windows 10 using the Universal Windows Platform.
HDR sensors
Modern CMOS image sensors can often capture a high dynamic range from a single exposure. The wide dynamic range of the captured image is non-linearly compressed into a smaller dynamic range electronic representation. However, with proper processing, the information from a single exposure can be used to create an HDR image.
Such HDR imaging is used in extreme dynamic range applications like welding or automotive work. Some other cameras designed for use in security applications can automatically provide two or more images for each frame, with changing exposure. For example, a sensor for 30fps video will give out 60fps with the odd frames at a short exposure time and the even frames at a longer exposure time. Some of the sensor may even combine the two images on-chip so that a wider dynamic range without in-pixel compression is directly available to the user for display or processing.
en.wikipedia.org/wiki/High-dynamic-range_imaging
Infrared Photography
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.)
When these filters are used together with infrared-sensitive film or sensors, "in-camera effects" can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the "Wood Effect," an effect mainly caused by foliage (such as tree leaves and grass) strongly reflecting in the same way visible light is reflected from snow. There is a small contribution from chlorophyll fluorescence, but this is marginal and is not the real cause of the brightness seen in infrared photographs. The effect is named after the infrared photography pioneer Robert W. Wood, and not after the material wood, which does not strongly reflect infrared.
The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze, caused by reduced Rayleigh scattering and Mie scattering, respectively, compared to visible light. The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also penetrate a few millimeters into skin and give a milky look to portraits, although eyes often look black.
Until the early 20th century, infrared photography was not possible because silver halide emulsions are not sensitive to longer wavelengths than that of blue light (and to a lesser extent, green light) without the addition of a dye to act as a color sensitizer. The first infrared photographs (as distinct from spectrographs) to be published appeared in the February 1910 edition of The Century Magazine and in the October 1910 edition of the Royal Photographic Society Journal to illustrate papers by Robert W. Wood, who discovered the unusual effects that now bear his name. The RPS co-ordinated events to celebrate the centenary of this event in 2010. Wood's photographs were taken on experimental film that required very long exposures; thus, most of his work focused on landscapes. A further set of infrared landscapes taken by Wood in Italy in 1911 used plates provided for him by CEK Mees at Wratten & Wainwright. Mees also took a few infrared photographs in Portugal in 1910, which are now in the Kodak archives.
Infrared-sensitive photographic plates were developed in the United States during World War I for spectroscopic analysis, and infrared sensitizing dyes were investigated for improved haze penetration in aerial photography. After 1930, new emulsions from Kodak and other manufacturers became useful to infrared astronomy.
Infrared photography became popular with photography enthusiasts in the 1930s when suitable film was introduced commercially. The Times regularly published landscape and aerial photographs taken by their staff photographers using Ilford infrared film. By 1937 33 kinds of infrared film were available from five manufacturers including Agfa, Kodak and Ilford. Infrared movie film was also available and was used to create day-for-night effects in motion pictures, a notable example being the pseudo-night aerial sequences in the James Cagney/Bette Davis movie The Bride Came COD.
False-color infrared photography became widely practiced with the introduction of Kodak Ektachrome Infrared Aero Film and Ektachrome Infrared EIR. The first version of this, known as Kodacolor Aero-Reversal-Film, was developed by Clark and others at the Kodak for camouflage detection in the 1940s. The film became more widely available in 35mm form in the 1960s but KODAK AEROCHROME III Infrared Film 1443 has been discontinued.
Infrared photography became popular with a number of 1960s recording artists, because of the unusual results; Jimi Hendrix, Donovan, Frank and a slow shutter speed without focus compensation, however wider apertures like f/2.0 can produce sharp photos only if the lens is meticulously refocused to the infrared index mark, and only if this index mark is the correct one for the filter and film in use. However, it should be noted that diffraction effects inside a camera are greater at infrared wavelengths so that stopping down the lens too far may actually reduce sharpness.
Most apochromatic ('APO') lenses do not have an Infrared index mark and do not need to be refocused for the infrared spectrum because they are already optically corrected into the near-infrared spectrum. Catadioptric lenses do not often require this adjustment because their mirror containing elements do not suffer from chromatic aberration and so the overall aberration is comparably less. Catadioptric lenses do, of course, still contain lenses, and these lenses do still have a dispersive property.
Infrared black-and-white films require special development times but development is usually achieved with standard black-and-white film developers and chemicals (like D-76). Kodak HIE film has a polyester film base that is very stable but extremely easy to scratch, therefore special care must be used in the handling of Kodak HIE throughout the development and printing/scanning process to avoid damage to the film. The Kodak HIE film was sensitive to 900 nm.
As of November 2, 2007, "KODAK is preannouncing the discontinuance" of HIE Infrared 35 mm film stating the reasons that, "Demand for these products has been declining significantly in recent years, and it is no longer practical to continue to manufacture given the low volume, the age of the product formulations and the complexity of the processes involved." At the time of this notice, HIE Infrared 135-36 was available at a street price of around $12.00 a roll at US mail order outlets.
Arguably the greatest obstacle to infrared film photography has been the increasing difficulty of obtaining infrared-sensitive film. However, despite the discontinuance of HIE, other newer infrared sensitive emulsions from EFKE, ROLLEI, and ILFORD are still available, but these formulations have differing sensitivity and specifications from the venerable KODAK HIE that has been around for at least two decades. Some of these infrared films are available in 120 and larger formats as well as 35 mm, which adds flexibility to their application. With the discontinuance of Kodak HIE, Efke's IR820 film has become the only IR film on the marketneeds update with good sensitivity beyond 750 nm, the Rollei film does extend beyond 750 nm but IR sensitivity falls off very rapidly.
Color infrared transparency films have three sensitized layers that, because of the way the dyes are coupled to these layers, reproduce infrared as red, red as green, and green as blue. All three layers are sensitive to blue so the film must be used with a yellow filter, since this will block blue light but allow the remaining colors to reach the film. The health of foliage can be determined from the relative strengths of green and infrared light reflected; this shows in color infrared as a shift from red (healthy) towards magenta (unhealthy). Early color infrared films were developed in the older E-4 process, but Kodak later manufactured a color transparency film that could be developed in standard E-6 chemistry, although more accurate results were obtained by developing using the AR-5 process. In general, color infrared does not need to be refocused to the infrared index mark on the lens.
In 2007 Kodak announced that production of the 35 mm version of their color infrared film (Ektachrome Professional Infrared/EIR) would cease as there was insufficient demand. Since 2011, all formats of color infrared film have been discontinued. Specifically, Aerochrome 1443 and SO-734.
There is no currently available digital camera that will produce the same results as Kodak color infrared film although the equivalent images can be produced by taking two exposures, one infrared and the other full-color, and combining in post-production. The color images produced by digital still cameras using infrared-pass filters are not equivalent to those produced on color infrared film. The colors result from varying amounts of infrared passing through the color filters on the photo sites, further amended by the Bayer filtering. While this makes such images unsuitable for the kind of applications for which the film was used, such as remote sensing of plant health, the resulting color tonality has proved popular artistically.
Color digital infrared, as part of full spectrum photography is gaining popularity. The ease of creating a softly colored photo with infrared characteristics has found interest among hobbyists and professionals.
In 2008, Los Angeles photographer, Dean Bennici started cutting and hand rolling Aerochrome color Infrared film. All Aerochrome medium and large format which exists today came directly from his lab. The trend in infrared photography continues to gain momentum with the success of photographer Richard Mosse and multiple users all around the world.
Digital camera sensors are inherently sensitive to infrared light, which would interfere with the normal photography by confusing the autofocus calculations or softening the image (because infrared light is focused differently from visible light), or oversaturating the red channel. Also, some clothing is transparent in the infrared, leading to unintended (at least to the manufacturer) uses of video cameras. Thus, to improve image quality and protect privacy, many digital cameras employ infrared blockers. Depending on the subject matter, infrared photography may not be practical with these cameras because the exposure times become overly long, often in the range of 30 seconds, creating noise and motion blur in the final image. However, for some subject matter the long exposure does not matter or the motion blur effects actually add to the image. Some lenses will also show a 'hot spot' in the centre of the image as their coatings are optimised for visible light and not for IR.
An alternative method of DSLR infrared photography is to remove the infrared blocker in front of the sensor and replace it with a filter that removes visible light. This filter is behind the mirror, so the camera can be used normally - handheld, normal shutter speeds, normal composition through the viewfinder, and focus, all work like a normal camera. Metering works but is not always accurate because of the difference between visible and infrared refraction. When the IR blocker is removed, many lenses which did display a hotspot cease to do so, and become perfectly usable for infrared photography. Additionally, because the red, green and blue micro-filters remain and have transmissions not only in their respective color but also in the infrared, enhanced infrared color may be recorded.
Since the Bayer filters in most digital cameras absorb a significant fraction of the infrared light, these cameras are sometimes not very sensitive as infrared cameras and can sometimes produce false colors in the images. An alternative approach is to use a Foveon X3 sensor, which does not have absorptive filters on it; the Sigma SD10 DSLR has a removable IR blocking filter and dust protector, which can be simply omitted or replaced by a deep red or complete visible light blocking filter. The Sigma SD14 has an IR/UV blocking filter that can be removed/installed without tools. The result is a very sensitive digital IR camera.
While it is common to use a filter that blocks almost all visible light, the wavelength sensitivity of a digital camera without internal infrared blocking is such that a variety of artistic results can be obtained with more conventional filtration. For example, a very dark neutral density filter can be used (such as the Hoya ND400) which passes a very small amount of visible light compared to the near-infrared it allows through. Wider filtration permits an SLR viewfinder to be used and also passes more varied color information to the sensor without necessarily reducing the Wood effect. Wider filtration is however likely to reduce other infrared artefacts such as haze penetration and darkened skies. This technique mirrors the methods used by infrared film photographers where black-and-white infrared film was often used with a deep red filter rather than a visually opaque one.
Another common technique with near-infrared filters is to swap blue and red channels in software (e.g. photoshop) which retains much of the characteristic 'white foliage' while rendering skies a glorious blue.
Several Sony cameras had the so-called Night Shot facility, which physically moves the blocking filter away from the light path, which makes the cameras very sensitive to infrared light. Soon after its development, this facility was 'restricted' by Sony to make it difficult for people to take photos that saw through clothing. To do this the iris is opened fully and exposure duration is limited to long times of more than 1/30 second or so. It is possible to shoot infrared but neutral density filters must be used to reduce the camera's sensitivity and the long exposure times mean that care must be taken to avoid camera-shake artifacts.
Fuji have produced digital cameras for use in forensic criminology and medicine which have no infrared blocking filter. The first camera, designated the S3 PRO UVIR, also had extended ultraviolet sensitivity (digital sensors are usually less sensitive to UV than to IR). Optimum UV sensitivity requires special lenses, but ordinary lenses usually work well for IR. In 2007, FujiFilm introduced a new version of this camera, based on the Nikon D200/ FujiFilm S5 called the IS Pro, also able to take Nikon lenses. Fuji had earlier introduced a non-SLR infrared camera, the IS-1, a modified version of the FujiFilm FinePix S9100. Unlike the S3 PRO UVIR, the IS-1 does not offer UV sensitivity. FujiFilm restricts the sale of these cameras to professional users with their EULA specifically prohibiting "unethical photographic conduct".
Phase One digital camera backs can be ordered in an infrared modified form.
Remote sensing and thermographic cameras are sensitive to longer wavelengths of infrared (see Infrared spectrum#Commonly used sub-division scheme). They may be multispectral and use a variety of technologies which may not resemble common camera or filter designs. Cameras sensitive to longer infrared wavelengths including those used in infrared astronomy often require cooling to reduce thermally induced dark currents in the sensor (see Dark current (physics)). Lower cost uncooled thermographic digital cameras operate in the Long Wave infrared band (see Thermographic camera#Uncooled infrared detectors). These cameras are generally used for building inspection or preventative maintenance but can be used for artistic pursuits as well.
IR HDR. IR converted Canon Rebel XTi. AEB +/-2 total of 3 exposures processed with Photomatix.
High Dynamic Range (HDR)
High-dynamic-range imaging (HDRI) is a high dynamic range (HDR) technique used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present a similar range of luminance to that experienced through the human visual system. The human eye, through adaptation of the iris and other methods, adjusts constantly to adapt to a broad range of luminance present in the environment. The brain continuously interprets this information so that a viewer can see in a wide range of light conditions.
HDR images can represent a greater range of luminance levels than can be achieved using more 'traditional' methods, such as many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. This is often achieved by capturing and then combining several different, narrower range, exposures of the same subject matter. Non-HDR cameras take photographs with a limited exposure range, referred to as LDR, resulting in the loss of detail in highlights or shadows.
The two primary types of HDR images are computer renderings and images resulting from merging multiple low-dynamic-range (LDR) or standard-dynamic-range (SDR) photographs. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor.
Due to the limitations of printing and display contrast, the extended luminosity range of an HDR image has to be compressed to be made visible. The method of rendering an HDR image to a standard monitor or printing device is called tone mapping. This method reduces the overall contrast of an HDR image to facilitate display on devices or printouts with lower dynamic range, and can be applied to produce images with preserved local contrast (or exaggerated for artistic effect).
In photography, dynamic range is measured in exposure value (EV) differences (known as stops). An increase of one EV, or 'one stop', represents a doubling of the amount of light. Conversely, a decrease of one EV represents a halving of the amount of light. Therefore, revealing detail in the darkest of shadows requires high exposures, while preserving detail in very bright situations requires very low exposures. Most cameras cannot provide this range of exposure values within a single exposure, due to their low dynamic range. High-dynamic-range photographs are generally achieved by capturing multiple standard-exposure images, often using exposure bracketing, and then later merging them into a single HDR image, usually within a photo manipulation program). Digital images are often encoded in a camera's raw image format, because 8-bit JPEG encoding does not offer a wide enough range of values to allow fine transitions (and regarding HDR, later introduces undesirable effects due to lossy compression).
Any camera that allows manual exposure control can make images for HDR work, although one equipped with auto exposure bracketing (AEB) is far better suited. Images from film cameras are less suitable as they often must first be digitized, so that they can later be processed using software HDR methods.
In most imaging devices, the degree of exposure to light applied to the active element (be it film or CCD) can be altered in one of two ways: by either increasing/decreasing the size of the aperture or by increasing/decreasing the time of each exposure. Exposure variation in an HDR set is only done by altering the exposure time and not the aperture size; this is because altering the aperture size also affects the depth of field and so the resultant multiple images would be quite different, preventing their final combination into a single HDR image.
An important limitation for HDR photography is that any movement between successive images will impede or prevent success in combining them afterwards. Also, as one must create several images (often three or five and sometimes more) to obtain the desired luminance range, such a full 'set' of images takes extra time. HDR photographers have developed calculation methods and techniques to partially overcome these problems, but the use of a sturdy tripod is, at least, advised.
Some cameras have an auto exposure bracketing (AEB) feature with a far greater dynamic range than others, from the 3 EV of the Canon EOS 40D, to the 18 EV of the Canon EOS-1D Mark II. As the popularity of this imaging method grows, several camera manufactures are now offering built-in HDR features. For example, the Pentax K-7 DSLR has an HDR mode that captures an HDR image and outputs (only) a tone mapped JPEG file. The Canon PowerShot G12, Canon PowerShot S95 and Canon PowerShot S100 offer similar features in a smaller format.. Nikon's approach is called 'Active D-Lighting' which applies exposure compensation and tone mapping to the image as it comes from the sensor, with the accent being on retaing a realistic effect . Some smartphones provide HDR modes, and most mobile platforms have apps that provide HDR picture taking.
Camera characteristics such as gamma curves, sensor resolution, noise, photometric calibration and color calibration affect resulting high-dynamic-range images.
Color film negatives and slides consist of multiple film layers that respond to light differently. As a consequence, transparent originals (especially positive slides) feature a very high dynamic range
Tone mapping
Tone mapping reduces the dynamic range, or contrast ratio, of an entire image while retaining localized contrast. Although it is a distinct operation, tone mapping is often applied to HDRI files by the same software package.
Several software applications are available on the PC, Mac and Linux platforms for producing HDR files and tone mapped images. Notable titles include
Adobe Photoshop
Aurora HDR
Dynamic Photo HDR
HDR Efex Pro
HDR PhotoStudio
Luminance HDR
MagicRaw
Oloneo PhotoEngine
Photomatix Pro
PTGui
Information stored in high-dynamic-range images typically corresponds to the physical values of luminance or radiance that can be observed in the real world. This is different from traditional digital images, which represent colors as they should appear on a monitor or a paper print. Therefore, HDR image formats are often called scene-referred, in contrast to traditional digital images, which are device-referred or output-referred. Furthermore, traditional images are usually encoded for the human visual system (maximizing the visual information stored in the fixed number of bits), which is usually called gamma encoding or gamma correction. The values stored for HDR images are often gamma compressed (power law) or logarithmically encoded, or floating-point linear values, since fixed-point linear encodings are increasingly inefficient over higher dynamic ranges.
HDR images often don't use fixed ranges per color channel—other than traditional images—to represent many more colors over a much wider dynamic range. For that purpose, they don't use integer values to represent the single color channels (e.g., 0-255 in an 8 bit per pixel interval for red, green and blue) but instead use a floating point representation. Common are 16-bit (half precision) or 32-bit floating point numbers to represent HDR pixels. However, when the appropriate transfer function is used, HDR pixels for some applications can be represented with a color depth that has as few as 10–12 bits for luminance and 8 bits for chrominance without introducing any visible quantization artifacts.
History of HDR photography
The idea of using several exposures to adequately reproduce a too-extreme range of luminance was pioneered as early as the 1850s by Gustave Le Gray to render seascapes showing both the sky and the sea. Such rendering was impossible at the time using standard methods, as the luminosity range was too extreme. Le Gray used one negative for the sky, and another one with a longer exposure for the sea, and combined the two into one picture in positive.
Mid 20th century
Manual tone mapping was accomplished by dodging and burning – selectively increasing or decreasing the exposure of regions of the photograph to yield better tonality reproduction. This was effective because the dynamic range of the negative is significantly higher than would be available on the finished positive paper print when that is exposed via the negative in a uniform manner. An excellent example is the photograph Schweitzer at the Lamp by W. Eugene Smith, from his 1954 photo essay A Man of Mercy on Dr. Albert Schweitzer and his humanitarian work in French Equatorial Africa. The image took 5 days to reproduce the tonal range of the scene, which ranges from a bright lamp (relative to the scene) to a dark shadow.
Ansel Adams elevated dodging and burning to an art form. Many of his famous prints were manipulated in the darkroom with these two methods. Adams wrote a comprehensive book on producing prints called The Print, which prominently features dodging and burning, in the context of his Zone System.
With the advent of color photography, tone mapping in the darkroom was no longer possible due to the specific timing needed during the developing process of color film. Photographers looked to film manufacturers to design new film stocks with improved response, or continued to shoot in black and white to use tone mapping methods.
Color film capable of directly recording high-dynamic-range images was developed by Charles Wyckoff and EG&G "in the course of a contract with the Department of the Air Force". This XR film had three emulsion layers, an upper layer having an ASA speed rating of 400, a middle layer with an intermediate rating, and a lower layer with an ASA rating of 0.004. The film was processed in a manner similar to color films, and each layer produced a different color. The dynamic range of this extended range film has been estimated as 1:108. It has been used to photograph nuclear explosions, for astronomical photography, for spectrographic research, and for medical imaging. Wyckoff's detailed pictures of nuclear explosions appeared on the cover of Life magazine in the mid-1950s.
Late 20th century
Georges Cornuéjols and licensees of his patents (Brdi, Hymatom) introduced the principle of HDR video image, in 1986, by interposing a matricial LCD screen in front of the camera's image sensor, increasing the sensors dynamic by five stops. The concept of neighborhood tone mapping was applied to video cameras by a group from the Technion in Israel led by Dr. Oliver Hilsenrath and Prof. Y.Y.Zeevi who filed for a patent on this concept in 1988.
In February and April 1990, Georges Cornuéjols introduced the first real-time HDR camera that combined two images captured by a sensor3435 or simultaneously3637 by two sensors of the camera. This process is known as bracketing used for a video stream.
In 1991, the first commercial video camera was introduced that performed real-time capturing of multiple images with different exposures, and producing an HDR video image, by Hymatom, licensee of Georges Cornuéjols.
Also in 1991, Georges Cornuéjols introduced the HDR+ image principle by non-linear accumulation of images to increase the sensitivity of the camera: for low-light environments, several successive images are accumulated, thus increasing the signal to noise ratio.
In 1993, another commercial medical camera producing an HDR video image, by the Technion.
Modern HDR imaging uses a completely different approach, based on making a high-dynamic-range luminance or light map using only global image operations (across the entire image), and then tone mapping the result. Global HDR was first introduced in 19931 resulting in a mathematical theory of differently exposed pictures of the same subject matter that was published in 1995 by Steve Mann and Rosalind Picard.
On October 28, 1998, Ben Sarao created one of the first nighttime HDR+G (High Dynamic Range + Graphic image)of STS-95 on the launch pad at NASA's Kennedy Space Center. It consisted of four film images of the shuttle at night that were digitally composited with additional digital graphic elements. The image was first exhibited at NASA Headquarters Great Hall, Washington DC in 1999 and then published in Hasselblad Forum, Issue 3 1993, Volume 35 ISSN 0282-5449.
The advent of consumer digital cameras produced a new demand for HDR imaging to improve the light response of digital camera sensors, which had a much smaller dynamic range than film. Steve Mann developed and patented the global-HDR method for producing digital images having extended dynamic range at the MIT Media Laboratory. Mann's method involved a two-step procedure: (1) generate one floating point image array by global-only image operations (operations that affect all pixels identically, without regard to their local neighborhoods); and then (2) convert this image array, using local neighborhood processing (tone-remapping, etc.), into an HDR image. The image array generated by the first step of Mann's process is called a lightspace image, lightspace picture, or radiance map. Another benefit of global-HDR imaging is that it provides access to the intermediate light or radiance map, which has been used for computer vision, and other image processing operations.
21st century
In 2005, Adobe Systems introduced several new features in Photoshop CS2 including Merge to HDR, 32 bit floating point image support, and HDR tone mapping.
On June 30, 2016, Microsoft added support for the digital compositing of HDR images to Windows 10 using the Universal Windows Platform.
HDR sensors
Modern CMOS image sensors can often capture a high dynamic range from a single exposure. The wide dynamic range of the captured image is non-linearly compressed into a smaller dynamic range electronic representation. However, with proper processing, the information from a single exposure can be used to create an HDR image.
Such HDR imaging is used in extreme dynamic range applications like welding or automotive work. Some other cameras designed for use in security applications can automatically provide two or more images for each frame, with changing exposure. For example, a sensor for 30fps video will give out 60fps with the odd frames at a short exposure time and the even frames at a longer exposure time. Some of the sensor may even combine the two images on-chip so that a wider dynamic range without in-pixel compression is directly available to the user for display or processing.
en.wikipedia.org/wiki/High-dynamic-range_imaging
Infrared Photography
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.)
When these filters are used together with infrared-sensitive film or sensors, "in-camera effects" can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the "Wood Effect," an effect mainly caused by foliage (such as tree leaves and grass) strongly reflecting in the same way visible light is reflected from snow. There is a small contribution from chlorophyll fluorescence, but this is marginal and is not the real cause of the brightness seen in infrared photographs. The effect is named after the infrared photography pioneer Robert W. Wood, and not after the material wood, which does not strongly reflect infrared.
The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze, caused by reduced Rayleigh scattering and Mie scattering, respectively, compared to visible light. The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also penetrate a few millimeters into skin and give a milky look to portraits, although eyes often look black.
Until the early 20th century, infrared photography was not possible because silver halide emulsions are not sensitive to longer wavelengths than that of blue light (and to a lesser extent, green light) without the addition of a dye to act as a color sensitizer. The first infrared photographs (as distinct from spectrographs) to be published appeared in the February 1910 edition of The Century Magazine and in the October 1910 edition of the Royal Photographic Society Journal to illustrate papers by Robert W. Wood, who discovered the unusual effects that now bear his name. The RPS co-ordinated events to celebrate the centenary of this event in 2010. Wood's photographs were taken on experimental film that required very long exposures; thus, most of his work focused on landscapes. A further set of infrared landscapes taken by Wood in Italy in 1911 used plates provided for him by CEK Mees at Wratten & Wainwright. Mees also took a few infrared photographs in Portugal in 1910, which are now in the Kodak archives.
Infrared-sensitive photographic plates were developed in the United States during World War I for spectroscopic analysis, and infrared sensitizing dyes were investigated for improved haze penetration in aerial photography. After 1930, new emulsions from Kodak and other manufacturers became useful to infrared astronomy.
Infrared photography became popular with photography enthusiasts in the 1930s when suitable film was introduced commercially. The Times regularly published landscape and aerial photographs taken by their staff photographers using Ilford infrared film. By 1937 33 kinds of infrared film were available from five manufacturers including Agfa, Kodak and Ilford. Infrared movie film was also available and was used to create day-for-night effects in motion pictures, a notable example being the pseudo-night aerial sequences in the James Cagney/Bette Davis movie The Bride Came COD.
False-color infrared photography became widely practiced with the introduction of Kodak Ektachrome Infrared Aero Film and Ektachrome Infrared EIR. The first version of this, known as Kodacolor Aero-Reversal-Film, was developed by Clark and others at the Kodak for camouflage detection in the 1940s. The film became more widely available in 35mm form in the 1960s but KODAK AEROCHROME III Infrared Film 1443 has been discontinued.
Infrared photography became popular with a number of 1960s recording artists, because of the unusual results; Jimi Hendrix, Donovan, Frank and a slow shutter speed without focus compensation, however wider apertures like f/2.0 can produce sharp photos only if the lens is meticulously refocused to the infrared index mark, and only if this index mark is the correct one for the filter and film in use. However, it should be noted that diffraction effects inside a camera are greater at infrared wavelengths so that stopping down the lens too far may actually reduce sharpness.
Most apochromatic ('APO') lenses do not have an Infrared index mark and do not need to be refocused for the infrared spectrum because they are already optically corrected into the near-infrared spectrum. Catadioptric lenses do not often require this adjustment because their mirror containing elements do not suffer from chromatic aberration and so the overall aberration is comparably less. Catadioptric lenses do, of course, still contain lenses, and these lenses do still have a dispersive property.
Infrared black-and-white films require special development times but development is usually achieved with standard black-and-white film developers and chemicals (like D-76). Kodak HIE film has a polyester film base that is very stable but extremely easy to scratch, therefore special care must be used in the handling of Kodak HIE throughout the development and printing/scanning process to avoid damage to the film. The Kodak HIE film was sensitive to 900 nm.
As of November 2, 2007, "KODAK is preannouncing the discontinuance" of HIE Infrared 35 mm film stating the reasons that, "Demand for these products has been declining significantly in recent years, and it is no longer practical to continue to manufacture given the low volume, the age of the product formulations and the complexity of the processes involved." At the time of this notice, HIE Infrared 135-36 was available at a street price of around $12.00 a roll at US mail order outlets.
Arguably the greatest obstacle to infrared film photography has been the increasing difficulty of obtaining infrared-sensitive film. However, despite the discontinuance of HIE, other newer infrared sensitive emulsions from EFKE, ROLLEI, and ILFORD are still available, but these formulations have differing sensitivity and specifications from the venerable KODAK HIE that has been around for at least two decades. Some of these infrared films are available in 120 and larger formats as well as 35 mm, which adds flexibility to their application. With the discontinuance of Kodak HIE, Efke's IR820 film has become the only IR film on the marketneeds update with good sensitivity beyond 750 nm, the Rollei film does extend beyond 750 nm but IR sensitivity falls off very rapidly.
Color infrared transparency films have three sensitized layers that, because of the way the dyes are coupled to these layers, reproduce infrared as red, red as green, and green as blue. All three layers are sensitive to blue so the film must be used with a yellow filter, since this will block blue light but allow the remaining colors to reach the film. The health of foliage can be determined from the relative strengths of green and infrared light reflected; this shows in color infrared as a shift from red (healthy) towards magenta (unhealthy). Early color infrared films were developed in the older E-4 process, but Kodak later manufactured a color transparency film that could be developed in standard E-6 chemistry, although more accurate results were obtained by developing using the AR-5 process. In general, color infrared does not need to be refocused to the infrared index mark on the lens.
In 2007 Kodak announced that production of the 35 mm version of their color infrared film (Ektachrome Professional Infrared/EIR) would cease as there was insufficient demand. Since 2011, all formats of color infrared film have been discontinued. Specifically, Aerochrome 1443 and SO-734.
There is no currently available digital camera that will produce the same results as Kodak color infrared film although the equivalent images can be produced by taking two exposures, one infrared and the other full-color, and combining in post-production. The color images produced by digital still cameras using infrared-pass filters are not equivalent to those produced on color infrared film. The colors result from varying amounts of infrared passing through the color filters on the photo sites, further amended by the Bayer filtering. While this makes such images unsuitable for the kind of applications for which the film was used, such as remote sensing of plant health, the resulting color tonality has proved popular artistically.
Color digital infrared, as part of full spectrum photography is gaining popularity. The ease of creating a softly colored photo with infrared characteristics has found interest among hobbyists and professionals.
In 2008, Los Angeles photographer, Dean Bennici started cutting and hand rolling Aerochrome color Infrared film. All Aerochrome medium and large format which exists today came directly from his lab. The trend in infrared photography continues to gain momentum with the success of photographer Richard Mosse and multiple users all around the world.
Digital camera sensors are inherently sensitive to infrared light, which would interfere with the normal photography by confusing the autofocus calculations or softening the image (because infrared light is focused differently from visible light), or oversaturating the red channel. Also, some clothing is transparent in the infrared, leading to unintended (at least to the manufacturer) uses of video cameras. Thus, to improve image quality and protect privacy, many digital cameras employ infrared blockers. Depending on the subject matter, infrared photography may not be practical with these cameras because the exposure times become overly long, often in the range of 30 seconds, creating noise and motion blur in the final image. However, for some subject matter the long exposure does not matter or the motion blur effects actually add to the image. Some lenses will also show a 'hot spot' in the centre of the image as their coatings are optimised for visible light and not for IR.
An alternative method of DSLR infrared photography is to remove the infrared blocker in front of the sensor and replace it with a filter that removes visible light. This filter is behind the mirror, so the camera can be used normally - handheld, normal shutter speeds, normal composition through the viewfinder, and focus, all work like a normal camera. Metering works but is not always accurate because of the difference between visible and infrared refraction. When the IR blocker is removed, many lenses which did display a hotspot cease to do so, and become perfectly usable for infrared photography. Additionally, because the red, green and blue micro-filters remain and have transmissions not only in their respective color but also in the infrared, enhanced infrared color may be recorded.
Since the Bayer filters in most digital cameras absorb a significant fraction of the infrared light, these cameras are sometimes not very sensitive as infrared cameras and can sometimes produce false colors in the images. An alternative approach is to use a Foveon X3 sensor, which does not have absorptive filters on it; the Sigma SD10 DSLR has a removable IR blocking filter and dust protector, which can be simply omitted or replaced by a deep red or complete visible light blocking filter. The Sigma SD14 has an IR/UV blocking filter that can be removed/installed without tools. The result is a very sensitive digital IR camera.
While it is common to use a filter that blocks almost all visible light, the wavelength sensitivity of a digital camera without internal infrared blocking is such that a variety of artistic results can be obtained with more conventional filtration. For example, a very dark neutral density filter can be used (such as the Hoya ND400) which passes a very small amount of visible light compared to the near-infrared it allows through. Wider filtration permits an SLR viewfinder to be used and also passes more varied color information to the sensor without necessarily reducing the Wood effect. Wider filtration is however likely to reduce other infrared artefacts such as haze penetration and darkened skies. This technique mirrors the methods used by infrared film photographers where black-and-white infrared film was often used with a deep red filter rather than a visually opaque one.
Another common technique with near-infrared filters is to swap blue and red channels in software (e.g. photoshop) which retains much of the characteristic 'white foliage' while rendering skies a glorious blue.
Several Sony cameras had the so-called Night Shot facility, which physically moves the blocking filter away from the light path, which makes the cameras very sensitive to infrared light. Soon after its development, this facility was 'restricted' by Sony to make it difficult for people to take photos that saw through clothing. To do this the iris is opened fully and exposure duration is limited to long times of more than 1/30 second or so. It is possible to shoot infrared but neutral density filters must be used to reduce the camera's sensitivity and the long exposure times mean that care must be taken to avoid camera-shake artifacts.
Fuji have produced digital cameras for use in forensic criminology and medicine which have no infrared blocking filter. The first camera, designated the S3 PRO UVIR, also had extended ultraviolet sensitivity (digital sensors are usually less sensitive to UV than to IR). Optimum UV sensitivity requires special lenses, but ordinary lenses usually work well for IR. In 2007, FujiFilm introduced a new version of this camera, based on the Nikon D200/ FujiFilm S5 called the IS Pro, also able to take Nikon lenses. Fuji had earlier introduced a non-SLR infrared camera, the IS-1, a modified version of the FujiFilm FinePix S9100. Unlike the S3 PRO UVIR, the IS-1 does not offer UV sensitivity. FujiFilm restricts the sale of these cameras to professional users with their EULA specifically prohibiting "unethical photographic conduct".
Phase One digital camera backs can be ordered in an infrared modified form.
Remote sensing and thermographic cameras are sensitive to longer wavelengths of infrared (see Infrared spectrum#Commonly used sub-division scheme). They may be multispectral and use a variety of technologies which may not resemble common camera or filter designs. Cameras sensitive to longer infrared wavelengths including those used in infrared astronomy often require cooling to reduce thermally induced dark currents in the sensor (see Dark current (physics)). Lower cost uncooled thermographic digital cameras operate in the Long Wave infrared band (see Thermographic camera#Uncooled infrared detectors). These cameras are generally used for building inspection or preventative maintenance but can be used for artistic pursuits as well.
On I-84 at exit 353. After following the Snake River for more than 320 miles, the emigrants took their last look at their watery guide and set forth across the sagebrush steppes of eastern Oregon. An interpretive shelter is located in the State Park. Wagon ruts are visible at nearby Birch Creek, which is accessible by road from the west side of the freeway interchange.
For more information contact:
100 Oregon Street
Vale, OR 97918
541-473-3144
BLM_OR_VL_Mail@blm.gov
Visitors walk along the interpretive trail. Other area facilities, including pavilions, interpretive panels, vault toilets and graveled parking lot are seen in the background.
BLM photo by Bob Wick.
LATITUDE/LONGITUDE
44.46243348 / -107.8156396
DIRECTIONS
Travel approximately eight miles east of Greybull WY (or four miles west of Shell) on US Highway 14 to the Red Gulch/Alkali National Back Country Byway turnoff. Head south on the Byway approximately five miles.
PHONE 307-347-5100
EMAIL worland_wymail@blm.gov
ADDRESS Worland Field Office
101 South 23rd
Worland, WY 82401
Idea Original: Rodrigo Fernández y Sebastian Ruiz
Coreografía y Dirección: Rodrigo Fernández
Asistencia de Dirección: Valentina Pavez
Diseño Integral: Rodrigo Fernández
Diseño Iluminación e Iluminador: Felipe Beltrán
Vestuario: Jorge Carrasco y Vicenta Pavez
Intérpretes: Compañía Danza en Cruz: Danya Jerez, Isadora Altamirano, Daniela Guajardo, Paulina Vera, Andrea Escobar, Nicolás González, Jorge Carrasco, Cristian Hewitt, Adrián Otárola, Andrés Millalonco.
Ganesha, also spelled Ganesh, and also known as Ganapati and Vinayaka, is a widely worshipped deity in the Hindu pantheon. His image is found throughout India and Nepal. Hindu sects worship him regardless of affiliations. Devotion to Ganesha is widely diffused and extends to Jains, Buddhists, and beyond India.
Although he is known by many attributes, Ganesha's elephant head makes him easy to identify. Ganesha is widely revered as the remover of obstacles, the patron of arts and sciences and the deva of intellect and wisdom. As the god of beginnings, he is honoured at the start of rituals and ceremonies. Ganesha is also invoked as patron of letters and learning during writing sessions. Several texts relate mythological anecdotes associated with his birth and exploits and explain his distinct iconography.
Ganesha emerged as a distinct deity in the 4th and 5th centuries CE, during the Gupta Period, although he inherited traits from Vedic and pre-Vedic precursors. He was formally included among the five primary deities of Smartism (a Hindu denomination) in the 9th century. A sect of devotees called the Ganapatya arose, who identified Ganesha as the supreme deity. The principal scriptures dedicated to Ganesha are the Ganesha Purana, the Mudgala Purana, and the Ganapati Atharvashirsa.
ETYMOLOGY AND OTHER NAMES
Ganesha has been ascribed many other titles and epithets, including Ganapati and Vighneshvara. The Hindu title of respect Shri is often added before his name. One popular way Ganesha is worshipped is by chanting a Ganesha Sahasranama, a litany of "a thousand names of Ganesha". Each name in the sahasranama conveys a different meaning and symbolises a different aspect of Ganesha. At least two different versions of the Ganesha Sahasranama exist; one version is drawn from the Ganesha Purana, a Hindu scripture venerating Ganesha.
The name Ganesha is a Sanskrit compound, joining the words gana, meaning a group, multitude, or categorical system and isha, meaning lord or master. The word gaņa when associated with Ganesha is often taken to refer to the gaņas, a troop of semi-divine beings that form part of the retinue of Shiva. The term more generally means a category, class, community, association, or corporation. Some commentators interpret the name "Lord of the Gaņas" to mean "Lord of Hosts" or "Lord of created categories", such as the elements. Ganapati, a synonym for Ganesha, is a compound composed of gaṇa, meaning "group", and pati, meaning "ruler" or "lord". The Amarakosha, an early Sanskrit lexicon, lists eight synonyms of Ganesha : Vinayaka, Vighnarāja (equivalent to Vighnesha), Dvaimātura (one who has two mothers), Gaṇādhipa (equivalent to Ganapati and Ganesha), Ekadanta (one who has one tusk), Heramba, Lambodara (one who has a pot belly, or, literally, one who has a hanging belly), and Gajanana; having the face of an elephant).
Vinayaka is a common name for Ganesha that appears in the Purāṇas and in Buddhist Tantras. This name is reflected in the naming of the eight famous Ganesha temples in Maharashtra known as the Ashtavinayak (aṣṭavināyaka). The names Vighnesha and Vighneshvara (Lord of Obstacles) refers to his primary function in Hindu theology as the master and remover of obstacles (vighna).
A prominent name for Ganesha in the Tamil language is Pillai. A. K. Narain differentiates these terms by saying that pillai means a "child" while pillaiyar means a "noble child". He adds that the words pallu, pella, and pell in the Dravidian family of languages signify "tooth or tusk", also "elephant tooth or tusk". Anita Raina Thapan notes that the root word pille in the name Pillaiyar might have originally meant "the young of the elephant", because the Pali word pillaka means "a young elephant".
In the Burmese language, Ganesha is known as Maha Peinne, derived from Pali Mahā Wināyaka. The widespread name of Ganesha in Thailand is Phra Phikhanet or Phra Phikhanesuan, both of which are derived from Vara Vighnesha and Vara Vighneshvara respectively, whereas the name Khanet (from Ganesha) is rather rare.
In Sri Lanka, in the North-Central and North Western areas with predominantly Buddhist population, Ganesha is known as Aiyanayaka Deviyo, while in other Singhala Buddhist areas he is known as Gana deviyo.
ICONOGRAPHY
Ganesha is a popular figure in Indian art. Unlike those of some deities, representations of Ganesha show wide variations and distinct patterns changing over time. He may be portrayed standing, dancing, heroically taking action against demons, playing with his family as a boy, sitting down or on an elevated seat, or engaging in a range of contemporary situations.
Ganesha images were prevalent in many parts of India by the 6th century. The 13th century statue pictured is typical of Ganesha statuary from 900–1200, after Ganesha had been well-established as an independent deity with his own sect. This example features some of Ganesha's common iconographic elements. A virtually identical statue has been dated between 973–1200 by Paul Martin-Dubost, and another similar statue is dated c. 12th century by Pratapaditya Pal. Ganesha has the head of an elephant and a big belly. This statue has four arms, which is common in depictions of Ganesha. He holds his own broken tusk in his lower-right hand and holds a delicacy, which he samples with his trunk, in his lower-left hand. The motif of Ganesha turning his trunk sharply to his left to taste a sweet in his lower-left hand is a particularly archaic feature. A more primitive statue in one of the Ellora Caves with this general form has been dated to the 7th century. Details of the other hands are difficult to make out on the statue shown. In the standard configuration, Ganesha typically holds an axe or a goad in one upper arm and a pasha (noose) in the other upper arm.
The influence of this old constellation of iconographic elements can still be seen in contemporary representations of Ganesha. In one modern form, the only variation from these old elements is that the lower-right hand does not hold the broken tusk but is turned towards the viewer in a gesture of protection or fearlessness (abhaya mudra). The same combination of four arms and attributes occurs in statues of Ganesha dancing, which is a very popular theme.
COMMON ATTRIBUTES
Ganesha has been represented with the head of an elephant since the early stages of his appearance in Indian art. Puranic myths provide many explanations for how he got his elephant head. One of his popular forms, Heramba-Ganapati, has five elephant heads, and other less-common variations in the number of heads are known. While some texts say that Ganesha was born with an elephant head, he acquires the head later in most stories. The most recurrent motif in these stories is that Ganesha was created by Parvati using clay to protect her and Shiva beheaded him when Ganesha came between Shiva and Parvati. Shiva then replaced Ganesha's original head with that of an elephant. Details of the battle and where the replacement head came from vary from source to source. Another story says that Ganesha was created directly by Shiva's laughter. Because Shiva considered Ganesha too alluring, he gave him the head of an elephant and a protruding belly.
Ganesha's earliest name was Ekadanta (One Tusked), referring to his single whole tusk, the other being broken. Some of the earliest images of Ganesha show him holding his broken tusk. The importance of this distinctive feature is reflected in the Mudgala Purana, which states that the name of Ganesha's second incarnation is Ekadanta. Ganesha's protruding belly appears as a distinctive attribute in his earliest statuary, which dates to the Gupta period (4th to 6th centuries). This feature is so important that, according to the Mudgala Purana, two different incarnations of Ganesha use names based on it: Lambodara (Pot Belly, or, literally, Hanging Belly) and Mahodara (Great Belly). Both names are Sanskrit compounds describing his belly. The Brahmanda Purana says that Ganesha has the name Lambodara because all the universes (i.e., cosmic eggs) of the past, present, and future are present in him. The number of Ganesha's arms varies; his best-known forms have between two and sixteen arms. Many depictions of Ganesha feature four arms, which is mentioned in Puranic sources and codified as a standard form in some iconographic texts. His earliest images had two arms. Forms with 14 and 20 arms appeared in Central India during the 9th and the 10th centuries. The serpent is a common feature in Ganesha iconography and appears in many forms. According to the Ganesha Purana, Ganesha wrapped the serpent Vasuki around his neck. Other depictions of snakes include use as a sacred thread wrapped around the stomach as a belt, held in a hand, coiled at the ankles, or as a throne. Upon Ganesha's forehead may be a third eye or the Shaivite sectarian mark , which consists of three horizontal lines. The Ganesha Purana prescribes a tilaka mark as well as a crescent moon on the forehead. A distinct form of Ganesha called Bhalachandra includes that iconographic element. Ganesha is often described as red in color. Specific colors are associated with certain forms. Many examples of color associations with specific meditation forms are prescribed in the Sritattvanidhi, a treatise on Hindu iconography. For example, white is associated with his representations as Heramba-Ganapati and Rina-Mochana-Ganapati (Ganapati Who Releases from Bondage). Ekadanta-Ganapati is visualized as blue during meditation in that form.
VAHANAS
The earliest Ganesha images are without a vahana (mount/vehicle). Of the eight incarnations of Ganesha described in the Mudgala Purana, Ganesha uses a mouse (shrew) in five of them, a lion in his incarnation as Vakratunda, a peacock in his incarnation as Vikata, and Shesha, the divine serpent, in his incarnation as Vighnaraja. Mohotkata uses a lion, Mayūreśvara uses a peacock, Dhumraketu uses a horse, and Gajanana uses a mouse, in the four incarnations of Ganesha listed in the Ganesha Purana. Jain depictions of Ganesha show his vahana variously as a mouse, elephant, tortoise, ram, or peacock.
Ganesha is often shown riding on or attended by a mouse, shrew or rat. Martin-Dubost says that the rat began to appear as the principal vehicle in sculptures of Ganesha in central and western India during the 7th century; the rat was always placed close to his feet. The mouse as a mount first appears in written sources in the Matsya Purana and later in the Brahmananda Purana and Ganesha Purana, where Ganesha uses it as his vehicle in his last incarnation. The Ganapati Atharvashirsa includes a meditation verse on Ganesha that describes the mouse appearing on his flag. The names Mūṣakavāhana (mouse-mount) and Ākhuketana (rat-banner) appear in the Ganesha Sahasranama.
The mouse is interpreted in several ways. According to Grimes, "Many, if not most of those who interpret Gaṇapati's mouse, do so negatively; it symbolizes tamoguṇa as well as desire". Along these lines, Michael Wilcockson says it symbolizes those who wish to overcome desires and be less selfish. Krishan notes that the rat is destructive and a menace to crops. The Sanskrit word mūṣaka (mouse) is derived from the root mūṣ (stealing, robbing). It was essential to subdue the rat as a destructive pest, a type of vighna (impediment) that needed to be overcome. According to this theory, showing Ganesha as master of the rat demonstrates his function as Vigneshvara (Lord of Obstacles) and gives evidence of his possible role as a folk grāma-devatā (village deity) who later rose to greater prominence. Martin-Dubost notes a view that the rat is a symbol suggesting that Ganesha, like the rat, penetrates even the most secret places.
ASSOCIATIONS
OBSTACLES
Ganesha is Vighneshvara or Vighnaraja or Vighnaharta (Marathi), the Lord of Obstacles, both of a material and spiritual order. He is popularly worshipped as a remover of obstacles, though traditionally he also places obstacles in the path of those who need to be checked. Paul Courtright says that "his task in the divine scheme of things, his dharma, is to place and remove obstacles. It is his particular territory, the reason for his creation."
Krishan notes that some of Ganesha's names reflect shadings of multiple roles that have evolved over time. Dhavalikar ascribes the quick ascension of Ganesha in the Hindu pantheon, and the emergence of the Ganapatyas, to this shift in emphasis from vighnakartā (obstacle-creator) to vighnahartā (obstacle-averter). However, both functions continue to be vital to his character.
BUDDHI (KNOWLEDGE)
Ganesha is considered to be the Lord of letters and learning. In Sanskrit, the word buddhi is a feminine noun that is variously translated as intelligence, wisdom, or intellect. The concept of buddhi is closely associated with the personality of Ganesha, especially in the Puranic period, when many stories stress his cleverness and love of intelligence. One of Ganesha's names in the Ganesha Purana and the Ganesha Sahasranama is Buddhipriya. This name also appears in a list of 21 names at the end of the Ganesha Sahasranama that Ganesha says are especially important. The word priya can mean "fond of", and in a marital context it can mean "lover" or "husband", so the name may mean either "Fond of Intelligence" or "Buddhi's Husband".
AUM
Ganesha is identified with the Hindu mantra Aum, also spelled Om. The term oṃkārasvarūpa (Aum is his form), when identified with Ganesha, refers to the notion that he personifies the primal sound. The Ganapati Atharvashirsa attests to this association. Chinmayananda translates the relevant passage as follows:
(O Lord Ganapati!) You are (the Trinity) Brahma, Vishnu, and Mahesa. You are Indra. You are fire [Agni] and air [Vāyu]. You are the sun [Sūrya] and the moon [Chandrama]. You are Brahman. You are (the three worlds) Bhuloka [earth], Antariksha-loka [space], and Swargaloka [heaven]. You are Om. (That is to say, You are all this).
Some devotees see similarities between the shape of Ganesha's body in iconography and the shape of Aum in the Devanāgarī and Tamil scripts.
FIRST CHAKRA
According to Kundalini yoga, Ganesha resides in the first chakra, called Muladhara (mūlādhāra). Mula means "original, main"; adhara means "base, foundation". The muladhara chakra is the principle on which the manifestation or outward expansion of primordial Divine Force rests. This association is also attested to in the Ganapati Atharvashirsa. Courtright translates this passage as follows: "[O Ganesha,] You continually dwell in the sacral plexus at the base of the spine [mūlādhāra cakra]." Thus, Ganesha has a permanent abode in every being at the Muladhara. Ganesha holds, supports and guides all other chakras, thereby "governing the forces that propel the wheel of life".
FAMILY AND CONSORTS
Though Ganesha is popularly held to be the son of Shiva and Parvati, the Puranic myths give different versions about his birth. In some he was created by Parvati, in another he was created by Shiva and Parvati, in another he appeared mysteriously and was discovered by Shiva and Parvati or he was born from the elephant headed goddess Malini after she drank Parvati's bath water that had been thrown in the river.
The family includes his brother the war god Kartikeya, who is also called Subramanya, Skanda, Murugan and other names. Regional differences dictate the order of their births. In northern India, Skanda is generally said to be the elder, while in the south, Ganesha is considered the first born. In northern India, Skanda was an important martial deity from about 500 BCE to about 600 CE, when worship of him declined significantly in northern India. As Skanda fell, Ganesha rose. Several stories tell of sibling rivalry between the brothers and may reflect sectarian tensions.
Ganesha's marital status, the subject of considerable scholarly review, varies widely in mythological stories. One pattern of myths identifies Ganesha as an unmarried brahmacari. This view is common in southern India and parts of northern India. Another pattern associates him with the concepts of Buddhi (intellect), Siddhi (spiritual power), and Riddhi (prosperity); these qualities are sometimes personified as goddesses, said to be Ganesha's wives. He also may be shown with a single consort or a nameless servant (Sanskrit: daşi). Another pattern connects Ganesha with the goddess of culture and the arts, Sarasvati or Śarda (particularly in Maharashtra). He is also associated with the goddess of luck and prosperity, Lakshmi. Another pattern, mainly prevalent in the Bengal region, links Ganesha with the banana tree, Kala Bo.
The Shiva Purana says that Ganesha had begotten two sons: Kşema (prosperity) and Lābha (profit). In northern Indian variants of this story, the sons are often said to be Śubha (auspiciouness) and Lābha. The 1975 Hindi film Jai Santoshi Maa shows Ganesha married to Riddhi and Siddhi and having a daughter named Santoshi Ma, the goddess of satisfaction. This story has no Puranic basis, but Anita Raina Thapan and Lawrence Cohen cite Santoshi Ma's cult as evidence of Ganesha's continuing evolution as a popular deity.
WOSHIP AND FESTIVALS
Ganesha is worshipped on many religious and secular occasions; especially at the beginning of ventures such as buying a vehicle or starting a business. K.N. Somayaji says, "there can hardly be a [Hindu] home [in India] which does not house an idol of Ganapati. [..] Ganapati, being the most popular deity in India, is worshipped by almost all castes and in all parts of the country". Devotees believe that if Ganesha is propitiated, he grants success, prosperity and protection against adversity.
Ganesha is a non-sectarian deity, and Hindus of all denominations invoke him at the beginning of prayers, important undertakings, and religious ceremonies. Dancers and musicians, particularly in southern India, begin performances of arts such as the Bharatnatyam dance with a prayer to Ganesha. Mantras such as Om Shri Gaṇeshāya Namah (Om, salutation to the Illustrious Ganesha) are often used. One of the most famous mantras associated with Ganesha is Om Gaṃ Ganapataye Namah (Om, Gaṃ, Salutation to the Lord of Hosts).
Devotees offer Ganesha sweets such as modaka and small sweet balls (laddus). He is often shown carrying a bowl of sweets, called a modakapātra. Because of his identification with the color red, he is often worshipped with red sandalwood paste (raktacandana) or red flowers. Dūrvā grass (Cynodon dactylon) and other materials are also used in his worship.
Festivals associated with Ganesh are Ganesh Chaturthi or Vināyaka chaturthī in the śuklapakṣa (the fourth day of the waxing moon) in the month of bhādrapada (August/September) and the Gaṇeśa jayanti (Gaṇeśa's birthday) celebrated on the cathurthī of the śuklapakṣa (fourth day of the waxing moon) in the month of māgha (January/February)."
GANESH CHATURTI
An annual festival honours Ganesha for ten days, starting on Ganesha Chaturthi, which typically falls in late August or early September. The festival begins with people bringing in clay idols of Ganesha, symbolising Ganesha's visit. The festival culminates on the day of Ananta Chaturdashi, when idols (murtis) of Ganesha are immersed in the most convenient body of water. Some families have a tradition of immersion on the 2nd, 3rd, 5th, or 7th day. In 1893, Lokmanya Tilak transformed this annual Ganesha festival from private family celebrations into a grand public event. He did so "to bridge the gap between the Brahmins and the non-Brahmins and find an appropriate context in which to build a new grassroots unity between them" in his nationalistic strivings against the British in Maharashtra. Because of Ganesha's wide appeal as "the god for Everyman", Tilak chose him as a rallying point for Indian protest against British rule. Tilak was the first to install large public images of Ganesha in pavilions, and he established the practice of submerging all the public images on the tenth day. Today, Hindus across India celebrate the Ganapati festival with great fervour, though it is most popular in the state of Maharashtra. The festival also assumes huge proportions in Mumbai, Pune, and in the surrounding belt of Ashtavinayaka temples.
TEMPLES
In Hindu temples, Ganesha is depicted in various ways: as an acolyte or subordinate deity (pãrśva-devatã); as a deity related to the principal deity (parivāra-devatã); or as the principal deity of the temple (pradhāna), treated similarly as the highest gods of the Hindu pantheon. As the god of transitions, he is placed at the doorway of many Hindu temples to keep out the unworthy, which is analogous to his role as Parvati’s doorkeeper. In addition, several shrines are dedicated to Ganesha himself, of which the Ashtavinayak (lit. "eight Ganesha (shrines)") in Maharashtra are particularly well known. Located within a 100-kilometer radius of the city of Pune, each of these eight shrines celebrates a particular form of Ganapati, complete with its own lore and legend. The eight shrines are: Morgaon, Siddhatek, Pali, Mahad, Theur, Lenyadri, Ozar and Ranjangaon.
There are many other important Ganesha temples at the following locations: Wai in Maharashtra; Ujjain in Madhya Pradesh; Jodhpur, Nagaur and Raipur (Pali) in Rajasthan; Baidyanath in Bihar; Baroda, Dholaka, and Valsad in Gujarat and Dhundiraj Temple in Varanasi, Uttar Pradesh. Prominent Ganesha temples in southern India include the following: Kanipakam in Chittoor; the Jambukeśvara Temple at Tiruchirapalli; at Rameshvaram and Suchindram in Tamil Nadu; at Malliyur, Kottarakara, Pazhavangadi, Kasargod in Kerala, Hampi, and Idagunji in Karnataka; and Bhadrachalam in Andhra Pradesh.
T. A. Gopinatha notes, "Every village however small has its own image of Vighneśvara (Vigneshvara) with or without a temple to house it in. At entrances of villages and forts, below pīpaḹa (Sacred fig) trees [...], in a niche [...] in temples of Viṣṇu (Vishnu) as well as Śiva (Shiva) and also in separate shrines specially constructed in Śiva temples [...]; the figure of Vighneśvara is invariably seen." Ganesha temples have also been built outside of India, including southeast Asia, Nepal (including the four Vinayaka shrines in the Kathmandu valley), and in several western countries.
RISE TO PROMINENCE
FIRST APEARANCE
Ganesha appeared in his classic form as a clearly recognizable deity with well-defined iconographic attributes in the early 4th to 5th centuries. Shanti Lal Nagar says that the earliest known iconic image of Ganesha is in the niche of the Shiva temple at Bhumra, which has been dated to the Gupta period. His independent cult appeared by about the 10th century. Narain summarizes the controversy between devotees and academics regarding the development of Ganesha as follows:
What is inscrutable is the somewhat dramatic appearance of Gaņeśa on the historical scene. His antecedents are not clear. His wide acceptance and popularity, which transcend sectarian and territorial limits, are indeed amazing. On the one hand there is the pious belief of the orthodox devotees in Gaņeśa's Vedic origins and in the Purāṇic explanations contained in the confusing, but nonetheless interesting, mythology. On the other hand there are doubts about the existence of the idea and the icon of this deity" before the fourth to fifth century A.D. ... [I]n my opinion, indeed there is no convincing evidence of the existence of this divinity prior to the fifth century.
POSSIBLE INFLUENCES
Courtright reviews various speculative theories about the early history of Ganesha, including supposed tribal traditions and animal cults, and dismisses all of them in this way:
In the post 600 BC period there is evidence of people and places named after the animal. The motif appears on coins and sculptures.
Thapan's book on the development of Ganesha devotes a chapter to speculations about the role elephants had in early India but concludes that, "although by the second century CE the elephant-headed yakṣa form exists it cannot be presumed to represent Gaṇapati-Vināyaka. There is no evidence of a deity by this name having an elephant or elephant-headed form at this early stage. Gaṇapati-Vināyaka had yet to make his debut."
One theory of the origin of Ganesha is that he gradually came to prominence in connection with the four Vinayakas (Vināyakas). In Hindu mythology, the Vināyakas were a group of four troublesome demons who created obstacles and difficulties but who were easily propitiated. The name Vināyaka is a common name for Ganesha both in the Purāṇas and in Buddhist Tantras. Krishan is one of the academics who accepts this view, stating flatly of Ganesha, "He is a non-vedic god. His origin is to be traced to the four Vināyakas, evil spirits, of the Mānavagŗhyasūtra (7th–4th century BCE) who cause various types of evil and suffering". Depictions of elephant-headed human figures, which some identify with Ganesha, appear in Indian art and coinage as early as the 2nd century. According to Ellawala, the elephant-headed Ganesha as lord of the Ganas was known to the people of Sri Lanka in the early pre-Christian era.
A metal plate depiction of Ganesha had been discovered in 1993, in Iran, it dated back to 1,200 BCE. Another one was discovered much before, in Lorestan Province of Iran.
First Ganesha's terracotta images are from 1st century CE found in Ter, Pal, Verrapuram and Chandraketugarh. These figures are small, with elephant head, two arms, and chubby physique. The earliest Ganesha icons in stone were carved in Mathura during Kushan times (2nd-3rd centuries CE).
VEDIC AND EPIC LITERATURE
The title "Leader of the group" (Sanskrit: gaṇapati) occurs twice in the Rig Veda, but in neither case does it refer to the modern Ganesha. The term appears in RV 2.23.1 as a title for Brahmanaspati, according to commentators. While this verse doubtless refers to Brahmanaspati, it was later adopted for worship of Ganesha and is still used today. In rejecting any claim that this passage is evidence of Ganesha in the Rig Veda, Ludo Rocher says that it "clearly refers to Bṛhaspati—who is the deity of the hymn—and Bṛhaspati only". Equally clearly, the second passage (RV 10.112.9) refers to Indra, who is given the epithet 'gaṇapati', translated "Lord of the companies (of the Maruts)." However, Rocher notes that the more recent Ganapatya literature often quotes the Rigvedic verses to give Vedic respectability to Ganesha .
Two verses in texts belonging to Black Yajurveda, Maitrāyaṇīya Saṃhitā (2.9.1) and Taittirīya Āraṇyaka (10.1), appeal to a deity as "the tusked one" (Dantiḥ), "elephant-faced" (Hastimukha), and "with a curved trunk" (Vakratuņḍa). These names are suggestive of Ganesha, and the 14th century commentator Sayana explicitly establishes this identification. The description of Dantin, possessing a twisted trunk (vakratuṇḍa) and holding a corn-sheaf, a sugar cane, and a club, is so characteristic of the Puranic Ganapati that Heras says "we cannot resist to accept his full identification with this Vedic Dantin". However, Krishan considers these hymns to be post-Vedic additions. Thapan reports that these passages are "generally considered to have been interpolated". Dhavalikar says, "the references to the elephant-headed deity in the Maitrāyaṇī Saṃhitā have been proven to be very late interpolations, and thus are not very helpful for determining the early formation of the deity".
Ganesha does not appear in Indian epic literature that is dated to the Vedic period. A late interpolation to the epic poem Mahabharata says that the sage Vyasa (Vyāsa) asked Ganesha to serve as his scribe to transcribe the poem as he dictated it to him. Ganesha agreed but only on condition that Vyasa recite the poem uninterrupted, that is, without pausing. The sage agreed, but found that to get any rest he needed to recite very complex passages so Ganesha would have to ask for clarifications. The story is not accepted as part of the original text by the editors of the critical edition of the Mahabharata, in which the twenty-line story is relegated to a footnote in an appendix. The story of Ganesha acting as the scribe occurs in 37 of the 59 manuscripts consulted during preparation of the critical edition. Ganesha's association with mental agility and learning is one reason he is shown as scribe for Vyāsa's dictation of the Mahabharata in this interpolation. Richard L. Brown dates the story to the 8th century, and Moriz Winternitz concludes that it was known as early as c. 900, but it was not added to the Mahabharata some 150 years later. Winternitz also notes that a distinctive feature in South Indian manuscripts of the Mahabharata is their omission of this Ganesha legend. The term vināyaka is found in some recensions of the Śāntiparva and Anuśāsanaparva that are regarded as interpolations. A reference to Vighnakartṛīṇām ("Creator of Obstacles") in Vanaparva is also believed to be an interpolation and does not appear in the critical edition.
PURANIC PERIOD
Stories about Ganesha often occur in the Puranic corpus. Brown notes while the Puranas "defy precise chronological ordering", the more detailed narratives of Ganesha's life are in the late texts, c. 600–1300. Yuvraj Krishan says that the Puranic myths about the birth of Ganesha and how he acquired an elephant's head are in the later Puranas, which were composed from c. 600 onwards. He elaborates on the matter to say that references to Ganesha in the earlier Puranas, such as the Vayu and Brahmanda Puranas, are later interpolations made during the 7th to 10th centuries.
In his survey of Ganesha's rise to prominence in Sanskrit literature, Ludo Rocher notes that:
Above all, one cannot help being struck by the fact that the numerous stories surrounding Gaṇeśa concentrate on an unexpectedly limited number of incidents. These incidents are mainly three: his birth and parenthood, his elephant head, and his single tusk. Other incidents are touched on in the texts, but to a far lesser extent.
Ganesha's rise to prominence was codified in the 9th century, when he was formally included as one of the five primary deities of Smartism. The 9th-century philosopher Adi Shankara popularized the "worship of the five forms" (Panchayatana puja) system among orthodox Brahmins of the Smarta tradition. This worship practice invokes the five deities Ganesha, Vishnu, Shiva, Devi, and Surya. Adi Shankara instituted the tradition primarily to unite the principal deities of these five major sects on an equal status. This formalized the role of Ganesha as a complementary deity.
SCRIPTURES
Once Ganesha was accepted as one of the five principal deities of Brahmanism, some Brahmins (brāhmaṇas) chose to worship Ganesha as their principal deity. They developed the Ganapatya tradition, as seen in the Ganesha Purana and the Mudgala Purana.
The date of composition for the Ganesha Purana and the Mudgala Purana - and their dating relative to one another - has sparked academic debate. Both works were developed over time and contain age-layered strata. Anita Thapan reviews comments about dating and provides her own judgement. "It seems likely that the core of the Ganesha Purana appeared around the twelfth and thirteenth centuries", she says, "but was later interpolated." Lawrence W. Preston considers the most reasonable date for the Ganesha Purana to be between 1100 and 1400, which coincides with the apparent age of the sacred sites mentioned by the text.
R.C. Hazra suggests that the Mudgala Purana is older than the Ganesha Purana, which he dates between 1100 and 1400. However, Phyllis Granoff finds problems with this relative dating and concludes that the Mudgala Purana was the last of the philosophical texts concerned with Ganesha. She bases her reasoning on the fact that, among other internal evidence, the Mudgala Purana specifically mentions the Ganesha Purana as one of the four Puranas (the Brahma, the Brahmanda, the Ganesha, and the Mudgala Puranas) which deal at length with Ganesha. While the kernel of the text must be old, it was interpolated until the 17th and 18th centuries as the worship of Ganapati became more important in certain regions. Another highly regarded scripture, the Ganapati Atharvashirsa, was probably composed during the 16th or 17th centuries.
BEYOND INDIA AND HINDUISM
Commercial and cultural contacts extended India's influence in western and southeast Asia. Ganesha is one of a number of Hindu deities who reached foreign lands as a result.
Ganesha was particularly worshipped by traders and merchants, who went out of India for commercial ventures. From approximately the 10th century onwards, new networks of exchange developed including the formation of trade guilds and a resurgence of money circulation. During this time, Ganesha became the principal deity associated with traders. The earliest inscription invoking Ganesha before any other deity is associated with the merchant community.
Hindus migrated to Maritime Southeast Asia and took their culture, including Ganesha, with them. Statues of Ganesha are found throughout the region, often beside Shiva sanctuaries. The forms of Ganesha found in Hindu art of Java, Bali, and Borneo show specific regional influences. The spread of Hindu culture to southeast Asia established Ganesha in modified forms in Burma, Cambodia, and Thailand. In Indochina, Hinduism and Buddhism were practiced side by side, and mutual influences can be seen in the iconography of Ganesha in the region. In Thailand, Cambodia, and among the Hindu classes of the Chams in Vietnam, Ganesha was mainly thought of as a remover of obstacles. Today in Buddhist Thailand, Ganesha is regarded as a remover of obstacles, the god of success.
Before the arrival of Islam, Afghanistan had close cultural ties with India, and the adoration of both Hindu and Buddhist deities was practiced. Examples of sculptures from the 5th to the 7th centuries have survived, suggesting that the worship of Ganesha was then in vogue in the region.
Ganesha appears in Mahayana Buddhism, not only in the form of the Buddhist god Vināyaka, but also as a Hindu demon form with the same name. His image appears in Buddhist sculptures during the late Gupta period. As the Buddhist god Vināyaka, he is often shown dancing. This form, called Nṛtta Ganapati, was popular in northern India, later adopted in Nepal, and then in Tibet. In Nepal, the Hindu form of Ganesha, known as Heramba, is popular; he has five heads and rides a lion. Tibetan representations of Ganesha show ambivalent views of him. A Tibetan rendering of Ganapati is tshogs bdag. In one Tibetan form, he is shown being trodden under foot by Mahākāla, (Shiva) a popular Tibetan deity. Other depictions show him as the Destroyer of Obstacles, and sometimes dancing. Ganesha appears in China and Japan in forms that show distinct regional character. In northern China, the earliest known stone statue of Ganesha carries an inscription dated to 531. In Japan, where Ganesha is known as Kangiten, the Ganesha cult was first mentioned in 806.
The canonical literature of Jainism does not mention the worship of Ganesha. However, Ganesha is worshipped by most Jains, for whom he appears to have taken over certain functions of Kubera. Jain connections with the trading community support the idea that Jainism took up Ganesha worship as a result of commercial connections. The earliest known Jain Ganesha statue dates to about the 9th century. A 15th-century Jain text lists procedures for the installation of Ganapati images. Images of Ganesha appear in the Jain temples of Rajasthan and Gujarat.
WIKIPEDIA
The Trail of Time is an interpretive walking trail that focuses on Grand Canyon's vistas and rocks, encouraging visitors to ponder, explore, and understand the magnitude of geologic time and the stories told by canyon's rock layers and landscapes. Walking the trail is intended to give park visitors a visceral appreciation for the magnitude of geologic time...
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This 4.56 km (2.83 mile) long trail is actually a geologic time-line. Each meter on the trail signifies one million years of Grand Canyon's geologic history; and bronze markers mark one meter intervals. Every tenth marker is labeled in millions of years. NPS Photo by Erin Whitakker
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For more information: tot.unm.edu/
The grounds of the NHTIC contain a wide variety of statues and interpretive panels. These statues of two horsemen looking west are located near the front entrance of the NHTIC grounds. BLM photo by Emmet Pruss.
You need to study art history for at least 7 years in order to be able to appreciate and interpret this piece of modern art at the French Pompidou centre.
Infrared converted Sony A6000 with Sony E 16mm F2.8 mounted with the Sony Ultra Wide Converter. HDR AEB +/-2 total of 3 exposures at F8, 16mm, auto focus and processed with Photomatix HDR software.
High Dynamic Range (HDR)
High-dynamic-range imaging (HDRI) is a high dynamic range (HDR) technique used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present a similar range of luminance to that experienced through the human visual system. The human eye, through adaptation of the iris and other methods, adjusts constantly to adapt to a broad range of luminance present in the environment. The brain continuously interprets this information so that a viewer can see in a wide range of light conditions.
HDR images can represent a greater range of luminance levels than can be achieved using more 'traditional' methods, such as many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. This is often achieved by capturing and then combining several different, narrower range, exposures of the same subject matter. Non-HDR cameras take photographs with a limited exposure range, referred to as LDR, resulting in the loss of detail in highlights or shadows.
The two primary types of HDR images are computer renderings and images resulting from merging multiple low-dynamic-range (LDR) or standard-dynamic-range (SDR) photographs. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor.
Due to the limitations of printing and display contrast, the extended luminosity range of an HDR image has to be compressed to be made visible. The method of rendering an HDR image to a standard monitor or printing device is called tone mapping. This method reduces the overall contrast of an HDR image to facilitate display on devices or printouts with lower dynamic range, and can be applied to produce images with preserved local contrast (or exaggerated for artistic effect).
In photography, dynamic range is measured in exposure value (EV) differences (known as stops). An increase of one EV, or 'one stop', represents a doubling of the amount of light. Conversely, a decrease of one EV represents a halving of the amount of light. Therefore, revealing detail in the darkest of shadows requires high exposures, while preserving detail in very bright situations requires very low exposures. Most cameras cannot provide this range of exposure values within a single exposure, due to their low dynamic range. High-dynamic-range photographs are generally achieved by capturing multiple standard-exposure images, often using exposure bracketing, and then later merging them into a single HDR image, usually within a photo manipulation program). Digital images are often encoded in a camera's raw image format, because 8-bit JPEG encoding does not offer a wide enough range of values to allow fine transitions (and regarding HDR, later introduces undesirable effects due to lossy compression).
Any camera that allows manual exposure control can make images for HDR work, although one equipped with auto exposure bracketing (AEB) is far better suited. Images from film cameras are less suitable as they often must first be digitized, so that they can later be processed using software HDR methods.
In most imaging devices, the degree of exposure to light applied to the active element (be it film or CCD) can be altered in one of two ways: by either increasing/decreasing the size of the aperture or by increasing/decreasing the time of each exposure. Exposure variation in an HDR set is only done by altering the exposure time and not the aperture size; this is because altering the aperture size also affects the depth of field and so the resultant multiple images would be quite different, preventing their final combination into a single HDR image.
An important limitation for HDR photography is that any movement between successive images will impede or prevent success in combining them afterwards. Also, as one must create several images (often three or five and sometimes more) to obtain the desired luminance range, such a full 'set' of images takes extra time. HDR photographers have developed calculation methods and techniques to partially overcome these problems, but the use of a sturdy tripod is, at least, advised.
Some cameras have an auto exposure bracketing (AEB) feature with a far greater dynamic range than others, from the 3 EV of the Canon EOS 40D, to the 18 EV of the Canon EOS-1D Mark II. As the popularity of this imaging method grows, several camera manufactures are now offering built-in HDR features. For example, the Pentax K-7 DSLR has an HDR mode that captures an HDR image and outputs (only) a tone mapped JPEG file. The Canon PowerShot G12, Canon PowerShot S95 and Canon PowerShot S100 offer similar features in a smaller format.. Nikon's approach is called 'Active D-Lighting' which applies exposure compensation and tone mapping to the image as it comes from the sensor, with the accent being on retaing a realistic effect . Some smartphones provide HDR modes, and most mobile platforms have apps that provide HDR picture taking.
Camera characteristics such as gamma curves, sensor resolution, noise, photometric calibration and color calibration affect resulting high-dynamic-range images.
Color film negatives and slides consist of multiple film layers that respond to light differently. As a consequence, transparent originals (especially positive slides) feature a very high dynamic range
Tone mapping
Tone mapping reduces the dynamic range, or contrast ratio, of an entire image while retaining localized contrast. Although it is a distinct operation, tone mapping is often applied to HDRI files by the same software package.
Several software applications are available on the PC, Mac and Linux platforms for producing HDR files and tone mapped images. Notable titles include
Adobe Photoshop
Aurora HDR
Dynamic Photo HDR
HDR Efex Pro
HDR PhotoStudio
Luminance HDR
MagicRaw
Oloneo PhotoEngine
Photomatix Pro
PTGui
Information stored in high-dynamic-range images typically corresponds to the physical values of luminance or radiance that can be observed in the real world. This is different from traditional digital images, which represent colors as they should appear on a monitor or a paper print. Therefore, HDR image formats are often called scene-referred, in contrast to traditional digital images, which are device-referred or output-referred. Furthermore, traditional images are usually encoded for the human visual system (maximizing the visual information stored in the fixed number of bits), which is usually called gamma encoding or gamma correction. The values stored for HDR images are often gamma compressed (power law) or logarithmically encoded, or floating-point linear values, since fixed-point linear encodings are increasingly inefficient over higher dynamic ranges.
HDR images often don't use fixed ranges per color channel—other than traditional images—to represent many more colors over a much wider dynamic range. For that purpose, they don't use integer values to represent the single color channels (e.g., 0-255 in an 8 bit per pixel interval for red, green and blue) but instead use a floating point representation. Common are 16-bit (half precision) or 32-bit floating point numbers to represent HDR pixels. However, when the appropriate transfer function is used, HDR pixels for some applications can be represented with a color depth that has as few as 10–12 bits for luminance and 8 bits for chrominance without introducing any visible quantization artifacts.
History of HDR photography
The idea of using several exposures to adequately reproduce a too-extreme range of luminance was pioneered as early as the 1850s by Gustave Le Gray to render seascapes showing both the sky and the sea. Such rendering was impossible at the time using standard methods, as the luminosity range was too extreme. Le Gray used one negative for the sky, and another one with a longer exposure for the sea, and combined the two into one picture in positive.
Mid 20th century
Manual tone mapping was accomplished by dodging and burning – selectively increasing or decreasing the exposure of regions of the photograph to yield better tonality reproduction. This was effective because the dynamic range of the negative is significantly higher than would be available on the finished positive paper print when that is exposed via the negative in a uniform manner. An excellent example is the photograph Schweitzer at the Lamp by W. Eugene Smith, from his 1954 photo essay A Man of Mercy on Dr. Albert Schweitzer and his humanitarian work in French Equatorial Africa. The image took 5 days to reproduce the tonal range of the scene, which ranges from a bright lamp (relative to the scene) to a dark shadow.
Ansel Adams elevated dodging and burning to an art form. Many of his famous prints were manipulated in the darkroom with these two methods. Adams wrote a comprehensive book on producing prints called The Print, which prominently features dodging and burning, in the context of his Zone System.
With the advent of color photography, tone mapping in the darkroom was no longer possible due to the specific timing needed during the developing process of color film. Photographers looked to film manufacturers to design new film stocks with improved response, or continued to shoot in black and white to use tone mapping methods.
Color film capable of directly recording high-dynamic-range images was developed by Charles Wyckoff and EG&G "in the course of a contract with the Department of the Air Force". This XR film had three emulsion layers, an upper layer having an ASA speed rating of 400, a middle layer with an intermediate rating, and a lower layer with an ASA rating of 0.004. The film was processed in a manner similar to color films, and each layer produced a different color. The dynamic range of this extended range film has been estimated as 1:108. It has been used to photograph nuclear explosions, for astronomical photography, for spectrographic research, and for medical imaging. Wyckoff's detailed pictures of nuclear explosions appeared on the cover of Life magazine in the mid-1950s.
Late 20th century
Georges Cornuéjols and licensees of his patents (Brdi, Hymatom) introduced the principle of HDR video image, in 1986, by interposing a matricial LCD screen in front of the camera's image sensor, increasing the sensors dynamic by five stops. The concept of neighborhood tone mapping was applied to video cameras by a group from the Technion in Israel led by Dr. Oliver Hilsenrath and Prof. Y.Y.Zeevi who filed for a patent on this concept in 1988.
In February and April 1990, Georges Cornuéjols introduced the first real-time HDR camera that combined two images captured by a sensor3435 or simultaneously3637 by two sensors of the camera. This process is known as bracketing used for a video stream.
In 1991, the first commercial video camera was introduced that performed real-time capturing of multiple images with different exposures, and producing an HDR video image, by Hymatom, licensee of Georges Cornuéjols.
Also in 1991, Georges Cornuéjols introduced the HDR+ image principle by non-linear accumulation of images to increase the sensitivity of the camera: for low-light environments, several successive images are accumulated, thus increasing the signal to noise ratio.
In 1993, another commercial medical camera producing an HDR video image, by the Technion.
Modern HDR imaging uses a completely different approach, based on making a high-dynamic-range luminance or light map using only global image operations (across the entire image), and then tone mapping the result. Global HDR was first introduced in 19931 resulting in a mathematical theory of differently exposed pictures of the same subject matter that was published in 1995 by Steve Mann and Rosalind Picard.
On October 28, 1998, Ben Sarao created one of the first nighttime HDR+G (High Dynamic Range + Graphic image)of STS-95 on the launch pad at NASA's Kennedy Space Center. It consisted of four film images of the shuttle at night that were digitally composited with additional digital graphic elements. The image was first exhibited at NASA Headquarters Great Hall, Washington DC in 1999 and then published in Hasselblad Forum, Issue 3 1993, Volume 35 ISSN 0282-5449.
The advent of consumer digital cameras produced a new demand for HDR imaging to improve the light response of digital camera sensors, which had a much smaller dynamic range than film. Steve Mann developed and patented the global-HDR method for producing digital images having extended dynamic range at the MIT Media Laboratory. Mann's method involved a two-step procedure: (1) generate one floating point image array by global-only image operations (operations that affect all pixels identically, without regard to their local neighborhoods); and then (2) convert this image array, using local neighborhood processing (tone-remapping, etc.), into an HDR image. The image array generated by the first step of Mann's process is called a lightspace image, lightspace picture, or radiance map. Another benefit of global-HDR imaging is that it provides access to the intermediate light or radiance map, which has been used for computer vision, and other image processing operations.
21st century
In 2005, Adobe Systems introduced several new features in Photoshop CS2 including Merge to HDR, 32 bit floating point image support, and HDR tone mapping.
On June 30, 2016, Microsoft added support for the digital compositing of HDR images to Windows 10 using the Universal Windows Platform.
HDR sensors
Modern CMOS image sensors can often capture a high dynamic range from a single exposure. The wide dynamic range of the captured image is non-linearly compressed into a smaller dynamic range electronic representation. However, with proper processing, the information from a single exposure can be used to create an HDR image.
Such HDR imaging is used in extreme dynamic range applications like welding or automotive work. Some other cameras designed for use in security applications can automatically provide two or more images for each frame, with changing exposure. For example, a sensor for 30fps video will give out 60fps with the odd frames at a short exposure time and the even frames at a longer exposure time. Some of the sensor may even combine the two images on-chip so that a wider dynamic range without in-pixel compression is directly available to the user for display or processing.
en.wikipedia.org/wiki/High-dynamic-range_imaging
Infrared Photography
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.)
When these filters are used together with infrared-sensitive film or sensors, "in-camera effects" can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the "Wood Effect," an effect mainly caused by foliage (such as tree leaves and grass) strongly reflecting in the same way visible light is reflected from snow. There is a small contribution from chlorophyll fluorescence, but this is marginal and is not the real cause of the brightness seen in infrared photographs. The effect is named after the infrared photography pioneer Robert W. Wood, and not after the material wood, which does not strongly reflect infrared.
The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze, caused by reduced Rayleigh scattering and Mie scattering, respectively, compared to visible light. The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also penetrate a few millimeters into skin and give a milky look to portraits, although eyes often look black.
Until the early 20th century, infrared photography was not possible because silver halide emulsions are not sensitive to longer wavelengths than that of blue light (and to a lesser extent, green light) without the addition of a dye to act as a color sensitizer. The first infrared photographs (as distinct from spectrographs) to be published appeared in the February 1910 edition of The Century Magazine and in the October 1910 edition of the Royal Photographic Society Journal to illustrate papers by Robert W. Wood, who discovered the unusual effects that now bear his name. The RPS co-ordinated events to celebrate the centenary of this event in 2010. Wood's photographs were taken on experimental film that required very long exposures; thus, most of his work focused on landscapes. A further set of infrared landscapes taken by Wood in Italy in 1911 used plates provided for him by CEK Mees at Wratten & Wainwright. Mees also took a few infrared photographs in Portugal in 1910, which are now in the Kodak archives.
Infrared-sensitive photographic plates were developed in the United States during World War I for spectroscopic analysis, and infrared sensitizing dyes were investigated for improved haze penetration in aerial photography. After 1930, new emulsions from Kodak and other manufacturers became useful to infrared astronomy.
Infrared photography became popular with photography enthusiasts in the 1930s when suitable film was introduced commercially. The Times regularly published landscape and aerial photographs taken by their staff photographers using Ilford infrared film. By 1937 33 kinds of infrared film were available from five manufacturers including Agfa, Kodak and Ilford. Infrared movie film was also available and was used to create day-for-night effects in motion pictures, a notable example being the pseudo-night aerial sequences in the James Cagney/Bette Davis movie The Bride Came COD.
False-color infrared photography became widely practiced with the introduction of Kodak Ektachrome Infrared Aero Film and Ektachrome Infrared EIR. The first version of this, known as Kodacolor Aero-Reversal-Film, was developed by Clark and others at the Kodak for camouflage detection in the 1940s. The film became more widely available in 35mm form in the 1960s but KODAK AEROCHROME III Infrared Film 1443 has been discontinued.
Infrared photography became popular with a number of 1960s recording artists, because of the unusual results; Jimi Hendrix, Donovan, Frank and a slow shutter speed without focus compensation, however wider apertures like f/2.0 can produce sharp photos only if the lens is meticulously refocused to the infrared index mark, and only if this index mark is the correct one for the filter and film in use. However, it should be noted that diffraction effects inside a camera are greater at infrared wavelengths so that stopping down the lens too far may actually reduce sharpness.
Most apochromatic ('APO') lenses do not have an Infrared index mark and do not need to be refocused for the infrared spectrum because they are already optically corrected into the near-infrared spectrum. Catadioptric lenses do not often require this adjustment because their mirror containing elements do not suffer from chromatic aberration and so the overall aberration is comparably less. Catadioptric lenses do, of course, still contain lenses, and these lenses do still have a dispersive property.
Infrared black-and-white films require special development times but development is usually achieved with standard black-and-white film developers and chemicals (like D-76). Kodak HIE film has a polyester film base that is very stable but extremely easy to scratch, therefore special care must be used in the handling of Kodak HIE throughout the development and printing/scanning process to avoid damage to the film. The Kodak HIE film was sensitive to 900 nm.
As of November 2, 2007, "KODAK is preannouncing the discontinuance" of HIE Infrared 35 mm film stating the reasons that, "Demand for these products has been declining significantly in recent years, and it is no longer practical to continue to manufacture given the low volume, the age of the product formulations and the complexity of the processes involved." At the time of this notice, HIE Infrared 135-36 was available at a street price of around $12.00 a roll at US mail order outlets.
Arguably the greatest obstacle to infrared film photography has been the increasing difficulty of obtaining infrared-sensitive film. However, despite the discontinuance of HIE, other newer infrared sensitive emulsions from EFKE, ROLLEI, and ILFORD are still available, but these formulations have differing sensitivity and specifications from the venerable KODAK HIE that has been around for at least two decades. Some of these infrared films are available in 120 and larger formats as well as 35 mm, which adds flexibility to their application. With the discontinuance of Kodak HIE, Efke's IR820 film has become the only IR film on the marketneeds update with good sensitivity beyond 750 nm, the Rollei film does extend beyond 750 nm but IR sensitivity falls off very rapidly.
Color infrared transparency films have three sensitized layers that, because of the way the dyes are coupled to these layers, reproduce infrared as red, red as green, and green as blue. All three layers are sensitive to blue so the film must be used with a yellow filter, since this will block blue light but allow the remaining colors to reach the film. The health of foliage can be determined from the relative strengths of green and infrared light reflected; this shows in color infrared as a shift from red (healthy) towards magenta (unhealthy). Early color infrared films were developed in the older E-4 process, but Kodak later manufactured a color transparency film that could be developed in standard E-6 chemistry, although more accurate results were obtained by developing using the AR-5 process. In general, color infrared does not need to be refocused to the infrared index mark on the lens.
In 2007 Kodak announced that production of the 35 mm version of their color infrared film (Ektachrome Professional Infrared/EIR) would cease as there was insufficient demand. Since 2011, all formats of color infrared film have been discontinued. Specifically, Aerochrome 1443 and SO-734.
There is no currently available digital camera that will produce the same results as Kodak color infrared film although the equivalent images can be produced by taking two exposures, one infrared and the other full-color, and combining in post-production. The color images produced by digital still cameras using infrared-pass filters are not equivalent to those produced on color infrared film. The colors result from varying amounts of infrared passing through the color filters on the photo sites, further amended by the Bayer filtering. While this makes such images unsuitable for the kind of applications for which the film was used, such as remote sensing of plant health, the resulting color tonality has proved popular artistically.
Color digital infrared, as part of full spectrum photography is gaining popularity. The ease of creating a softly colored photo with infrared characteristics has found interest among hobbyists and professionals.
In 2008, Los Angeles photographer, Dean Bennici started cutting and hand rolling Aerochrome color Infrared film. All Aerochrome medium and large format which exists today came directly from his lab. The trend in infrared photography continues to gain momentum with the success of photographer Richard Mosse and multiple users all around the world.
Digital camera sensors are inherently sensitive to infrared light, which would interfere with the normal photography by confusing the autofocus calculations or softening the image (because infrared light is focused differently from visible light), or oversaturating the red channel. Also, some clothing is transparent in the infrared, leading to unintended (at least to the manufacturer) uses of video cameras. Thus, to improve image quality and protect privacy, many digital cameras employ infrared blockers. Depending on the subject matter, infrared photography may not be practical with these cameras because the exposure times become overly long, often in the range of 30 seconds, creating noise and motion blur in the final image. However, for some subject matter the long exposure does not matter or the motion blur effects actually add to the image. Some lenses will also show a 'hot spot' in the centre of the image as their coatings are optimised for visible light and not for IR.
An alternative method of DSLR infrared photography is to remove the infrared blocker in front of the sensor and replace it with a filter that removes visible light. This filter is behind the mirror, so the camera can be used normally - handheld, normal shutter speeds, normal composition through the viewfinder, and focus, all work like a normal camera. Metering works but is not always accurate because of the difference between visible and infrared refraction. When the IR blocker is removed, many lenses which did display a hotspot cease to do so, and become perfectly usable for infrared photography. Additionally, because the red, green and blue micro-filters remain and have transmissions not only in their respective color but also in the infrared, enhanced infrared color may be recorded.
Since the Bayer filters in most digital cameras absorb a significant fraction of the infrared light, these cameras are sometimes not very sensitive as infrared cameras and can sometimes produce false colors in the images. An alternative approach is to use a Foveon X3 sensor, which does not have absorptive filters on it; the Sigma SD10 DSLR has a removable IR blocking filter and dust protector, which can be simply omitted or replaced by a deep red or complete visible light blocking filter. The Sigma SD14 has an IR/UV blocking filter that can be removed/installed without tools. The result is a very sensitive digital IR camera.
While it is common to use a filter that blocks almost all visible light, the wavelength sensitivity of a digital camera without internal infrared blocking is such that a variety of artistic results can be obtained with more conventional filtration. For example, a very dark neutral density filter can be used (such as the Hoya ND400) which passes a very small amount of visible light compared to the near-infrared it allows through. Wider filtration permits an SLR viewfinder to be used and also passes more varied color information to the sensor without necessarily reducing the Wood effect. Wider filtration is however likely to reduce other infrared artefacts such as haze penetration and darkened skies. This technique mirrors the methods used by infrared film photographers where black-and-white infrared film was often used with a deep red filter rather than a visually opaque one.
Another common technique with near-infrared filters is to swap blue and red channels in software (e.g. photoshop) which retains much of the characteristic 'white foliage' while rendering skies a glorious blue.
Several Sony cameras had the so-called Night Shot facility, which physically moves the blocking filter away from the light path, which makes the cameras very sensitive to infrared light. Soon after its development, this facility was 'restricted' by Sony to make it difficult for people to take photos that saw through clothing. To do this the iris is opened fully and exposure duration is limited to long times of more than 1/30 second or so. It is possible to shoot infrared but neutral density filters must be used to reduce the camera's sensitivity and the long exposure times mean that care must be taken to avoid camera-shake artifacts.
Fuji have produced digital cameras for use in forensic criminology and medicine which have no infrared blocking filter. The first camera, designated the S3 PRO UVIR, also had extended ultraviolet sensitivity (digital sensors are usually less sensitive to UV than to IR). Optimum UV sensitivity requires special lenses, but ordinary lenses usually work well for IR. In 2007, FujiFilm introduced a new version of this camera, based on the Nikon D200/ FujiFilm S5 called the IS Pro, also able to take Nikon lenses. Fuji had earlier introduced a non-SLR infrared camera, the IS-1, a modified version of the FujiFilm FinePix S9100. Unlike the S3 PRO UVIR, the IS-1 does not offer UV sensitivity. FujiFilm restricts the sale of these cameras to professional users with their EULA specifically prohibiting "unethical photographic conduct".
Phase One digital camera backs can be ordered in an infrared modified form.
Remote sensing and thermographic cameras are sensitive to longer wavelengths of infrared (see Infrared spectrum#Commonly used sub-division scheme). They may be multispectral and use a variety of technologies which may not resemble common camera or filter designs. Cameras sensitive to longer infrared wavelengths including those used in infrared astronomy often require cooling to reduce thermally induced dark currents in the sensor (see Dark current (physics)). Lower cost uncooled thermographic digital cameras operate in the Long Wave infrared band (see Thermographic camera#Uncooled infrared detectors). These cameras are generally used for building inspection or preventative maintenance but can be used for artistic pursuits as well.
Sunset view of the McDonald Crossing Interpretive Site, above the west bank of the John Day Wild and Scenic River, Dec. 21, 2017, by Greg Shine, BLM.
Thousands of resettlers traveling west on the Oregon Trail used the shallow river ford, known today as McDonald Crossing, to traverse the lower John Day River on their way to the Willamette Valley and lands beyond. Today, McDonald Crossing is a rare confluence where national historic trail meets national wild and scenic river. At the McDonald Crossing interpretive site –a short distance from the western, Sherman County riverbank –a historic monument, ramada and informational signs help interpret the Oregon National Historic Trail and the area’s history.
For more information, contact our Prineville District Office at (541) 416-6700 or visit at 3050 NE 3rd St., Prineville, OR 97754.
The National Historic Oregon Trail Interpretive Center (NHOTIC) in Baker City, Oregon, offers living history demonstrations, interpretive programs, exhibits, multi-media presentations, special events, and more than four miles of interpretive trails. For more information, call 541-523-1843 or visit online at www.blm.gov/learn/interpretive-centers/national-historic-....
The mailing address is:
National Historic Oregon Trail Information Center
22267 Oregon Hwy 86
PO Box 987
Baker City, OR 97814