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first time trying the brenizer method - a total of 25 images. didn't really turn out how I had hoped but still looks fairly nice. playing with different tones in post as well.
(Moving)
Taking my chance
(Learning)
Methods of dance
Methods of dance
Japan/David Sylvian
OM4
Vivtar 200/3
Fujichrome Sensia 200
E6
No filters
... stitching multiple shots with the aim of replicating the shallow depth of field of a much faster lens or the field of view of a wider lens.
What isn't stated in Photojojo's breathless description of using the Brenizer method for getting "impossibly shallow depths of field" is that:
a) a wide aperture helps
b) regular autostitching/panorama software will choke when it's handed impossibly blurry shots.
The above panorama was built by the free Autostitch (Autopano Pro has licensed their engine) using about 50 overlapping shots that had been taken with a Nikon 50mm f1.8 lens at f2.2. The closest and furthest shots were lacking detail or were too blurred for the software to be able to find matching points, hence the blank corners.
If the software is sufficiently advanced then it will let you move and distort the shots to match their neighbours. I wasted some time in Autopano Pro trying to manouevre the corner shots into the gaps. After 20 minutes of rendering, it then crashed on me.
The much more basic Autostitch took only 30 seconds from start to finish.
30 views @ 50mm - f/1.7
Using Brenizer Method Calculation :
Effective focal length : 22mm
Effective aperture : f/0.75
any comment are welcome
feat. Ewen ♥
via
Finding the best beauty spa near you may not be an easy task after all. With so many spas functioning in the area, what should you look for in a quality spa? The spa you select should provide the right environment for you at all times. Here are important tips to consider when finding the best beauty spa near you.
Googling it is the easiest way to find a reputable day spa near you. Type in spas and your zip code or town name at the end of it see the results that come up in the search results. Owner of Lisa’s Day Spa in Chula Vista, says, check the websites of the resultant spas and see what kind of skin care treatments they offer and the prices. Does it fit your budget and style? Read client reviews and testimonials to find out whether other people really like the quality of service they offer. If you like what you see and read, give them a call. Is the staff knowledgeable and helpful? Make sure to ask for a tour of the facility before you make an appointment. Especially, check the locker room, and you can get a better idea about the safety, maintenance, and sanitary status of the spa. If you find hair in the wash basin or drain, it is a big no-no. Never select a beauty spa that doesn’t provide the highest sanitary conditions at all times.
Most of the time, treatment rooms might be off limits to clients. But you can always request them to show you the condition of a room. Observe how the other clients are treated to get a better understanding of the experience you are going to have. Once you are really satisfied with all the aforementioned factors, only you should think of making a reservation with the potential beauty spa.
Here are some of the best methods of picking the right spa near you. If you have a personal recommendation from someone you trust, you should always go to such a spa. These people have already experienced the quality of treatment offered by the spa and their recommendation counts a lot. The price of the treatment may depend on the style, quality, and duration of the treatment. Compare prices of different spas near you before you decide on what’s best for you. This way you can easily find a reputable and experienced beauty spa near you.
The skills and experience of the staff are extremely important when picking the right spa near you. In fact, a skilled and experienced therapist can put you at ease from the start. Some people can be more gifted than others. You need to pick the right therapist to perform the treatment.
In conclusion, with numerous beauty spas near you, how are you going to pick the right one? There are many things to look for when selecting the right spa. Your research is quite important when finding the best beauty spa near you. You can make an informed decision under such circumstances.
The post How To Find The Best Beauty Spa Near You? appeared first on CCCP Fashion and Beauty.
Project by:
Federica Bardelli
Alessandro Marino Giuseppe Brunetti
Gabriele Colombo
Giulia De Amicis
Carlo Alessandro Morgan De Gaetano
Designer unknown (佚名)
1956, February
Important methods to increase agricultural production
Zengjia nongye shengchande zhuyao banfa (增加农业生产的主要办法)
Call nr.: BG E15/793 (Landsberger collection)
Method Furniture had their official debut collection launch on Saturday 19th June. I was invited along with a very talented tattoo artist Alex Rattray to collaborate with Method Furniture to create artwork for their "CUBE."A very simple yet versatile piece of furniture that can be hung on the wall, act as a bedside table or what ever else you can thing of using it for in your home.
This is my "CUBE" which is a run of 10. That's right there are ten of these available. not like me I know but there is a twist that will have sure that each one will be unique. The stencil work is combined with brush work mixed with splatters and drips, techniques that I continue to play and experiment with in my studio and really enjoy.
The cube itself is a large piece with each side scaling at 40 x 40.
The collaboration with myself, Alex and Method is a good combination as all of us have a passion for detail and the finish on the furniture is no exception. I highly recommend check out the Method Furniture Website.
Any enquiries regarding the "CUBE" should be made directly with Method Furniture.
The hull of the "John B. Aird" showing a little 'wear & tear' as she navigates the Black River while arriving in Lorain, OH to take on a load.
Pelegry method calotype.
Deardorff 8x10.
EV13, f/6.3 @ 2.30
At first I was a little upset to see the contamination marks running from the top left corner, but when inverted, it looks like rays of light shining from the heavens. I like it now.
On November 13, 1864, here at St. Mary’s Catholic Church, Dr. Samuel A. Mudd was introduced to John Wilkes Booth, the future assassin of President Abraham Lincoln. Booth had come to Charles County to contact the Confederate underground here and recruit men to help him kidnap the president. Mudd’s wife, Sarah, later wrote:
“The first time I ever saw John Wilkes Booth was in November 1864. My husband went to Bryantown Church [St. Mary’s] and was introduced to Booth by John Thompson, an old friend from Baltimore, who asked my husband if he knew of anyone who had a good riding-horse for sale, to which, he replied, ‘My next neighbor has one.’ Booth came to our home that evening to see about buying the horse. The next morning after breakfast Booth and Dr. Mudd walked across the field to Squire George Gardener’s. Booth soon returned, came in, got his overcoat, and rode away. The horse he purchased was sent to him at Bryantown that evening.”
Booth and Mudd met several more times before the doctor set Booth’s broken leg at Mudd’s home on April 15, 1865. The Mudds are buried in the church cemetery by the parking lot, to the left of the church. Dr. Mudd was born on December 20, 1833, and died on January 10, 1883. Sarah Frances Dyer, his wife, was born on March 15, 1835, and died on December 29, 1911.
By Tom Fuchs, March 31, 2007
2. St. Mary’s Church
The front of the church, to the left in the darker brick, are the original 1845 walls.
The church cemetery contains the graves of several Mudd and Dyer relatives.
This Objective cell and its associated eccentric ring allows collimation of the binocular without the use of prism tilt screws. The Objective cell has an eccentric to allow the lens to move in any direction by a few millimetres.
The ring just out of the frame screws down onto the assembled parts locking them into position. Marking the position of the slot in the ring with a pencil to the lens cell and outer barrel of the binocular will allow you to keep tabs on the original position.
Anna May Wong, Akim Tamiroff, Gail Patrick and Lloyd Nolan star in this thrilling crime drama.Based on a play by Edgar Wallace.
Racketeer Steve Recka, art patron and political power-maker, rules his town and Madame Lan Ying, his beautiful Oriental friend and hostess (read: mistress), with an iron hand. He meets Margaret Van Kase, a socialite not impressed by his power nor his wealth, having no money herself, and Steve makes frantic efforts to win her and turns away from the loyal Lin Yang. Margaret ignores him as she plans to wed Philip Easton, a penniless bond salesman. The furious Recka, poses as a friend to Easton, while planning to ruin him. His henchmen kidnap Easton when he is carrying a large assignment of bonds, and he is branded as a runaway thief. The only doubters are Margaret and Police Inspector Brandon, who knows Recka's methods and suspects foul play. Easton is found in an abandoned house and arrested as the gangsters have taken the bonds and tipped the police where to find him. Recka offers to clear Easton if Margaret will become his bride and, while her hatred for Recka is intense, her love
FIRST ASIAN AMERICAN STAR!
Written by PHILIP LEIBFRIED
Her complexion was described as "a rose blushing through old ivory;" she was beautiful, tall (5'7"), slender, and Chinese-American. The last fact kept her from attaining the highest echelon among Hollywood's pantheon of stars, but it did not affect her popularity, nor keep her from becoming a household name. She was Anna May Wong, nee Wong Liu Tsong, a name which translates to "Frosted Yellow Willows," and she was born, appropriately enough, on Flower Street in Los Angeles' Chinatown on 3 January 1905, above her father's laundry. Anna May Wong's contribution to show business is a unique one; she was the first Asian female to become a star, achieving that stardom at a time when bias against her race was crushing. With determination and talent allied to her exotic beauty, she remained the only Asian female star throughout her forty-year career, never fully overcoming all prejudices in maintaining that position. Perhaps the rediscovery of her art will elevate her star to the pantheon of great performers and serve as a guiding light to Asian performers who still struggle to find their rightful place. Anna May Wong's life and career is something that is important for all who value greatly the Asian / Asian Pacific American communities' many artists and what we can all contribute!
Excerpt from : That Old Feeling: Anna May Wong
Part II of Richard Corliss' tribute to the pioneer Chinese-American star.
Daughter of the Dragon. Paramount 1931.
Based on a Fu Manchu novel by Sax Rohmer.
Daughter of the Dragon extended the curse sworn by Dr. Fu on the Petrie family to the next generation. Fu Manchu (Warner Oland), long ago injured and exiled in an attempt on Petrie Sr., returns to London and confronts the father: "In the 20 years I have fought to live," he says in his florid maleficence, "the thought of killing you and your son has been my dearest nurse." He kills the father, is mortally wounded himself and, on his deathbed, reveals his identity to his daughter Ling Moy (Wong) and elicits her vow that she will "cancel the debt" to the Fu family honor and murder the son, Ronald (Bramwell Fletcher)... who, dash it all, is madly infatuated with Ling Moy. Ronald has seen "Princess Ling Moy Celebrated Oriental Dancer" perform, and the vision has made him woozy. "I wish I could find a word to describe her," this calf-man effuses. "Exotic that's the word! And she's intriguing, if you know what I mean." In a near-clinch, Ling Moy wonders if a Chinese woman can appeal to a British toff. When he begs her to "chuck everything and stay," she asks him, "If I stayed, would my hair ever become golden curls, and my skin ivory, like Ronald's?" But the lure of the exotic is hard to shake. "Strange," he says, "I prefer yours. I shall never forget your hair and your eyes." They almost kiss ... when an off-camera scream shakes him out of his dream. It is from his girlfriend Joan (Frances Dade), and the societal message is as clear and shrill: white woman alerting white man to treachery of yellow woman. Ling Moy, a nice girl, previously unaware of her lineage, might be expected to struggle, at least briefly, with the shock of her identity and the dreadful deed her father obliges her to perform. But Wong makes an instant transformation, hissing, "The blood is mine. The hatred is mine. The vengeance shall be mine." Just before his death, Fu mourns that he has no son to kill Ronald. But, in a good full-throated reading, Wong vows: "Father, father, I will be your son. I will be your son!" The audience then has the fun of watching her stoke Ronald's ardor while plotting his death. When she is with him, pleading and salesmanship radiate from her bigeyes. But when an ally asks her why she keeps encouraging the lad, she sneers and says, "I am giving him a beautiful illusion. Which I shall crush." As a villainess, she is just getting started. Revealing her mission to Ronald, she tells him she plans to kill Joan "Because you must have a thousand bitter tastes of death before you die." (The ripe dialogue is by Hollywood neophyte Sidney Buchman, whose distinguished list of credits would include Mr. Smith Goes to Washington, Here Comes Mr Jordan and The Talk of the Town.) She soon ascends on a geyser of madness as she decides on a new torture: "My vengeance is inspired tonight. You will first have the torture of seeing her beauty eaten slowly away by this hungry acid." An aide holds a hose gadget over Joan's soon-to-be-corroded face, and Ronald cries for Ling Moy to stop. Very well she says. "Ling Moy is merciful." She barks at Ronald: "Kill her!" He must decide if his favorite white girl is to be etched with acid or stabbed to death. Great stuff! Melodrama is the art of knowing how precisely too far to goThe film is a triangle: not so much of Ling Moy, Ronald and Joan as of Ling Moy, Ronald and a Chinese detective, Ah Kee, played by Sessue Hayakawa, the Japanese actor who in the teens was Hollywood's first Asian male star. He's not plausibly Chinese here, and he is in a constant, losing battle with spoken English. But he is a part of movie history, in the only studio film of the Golden Age to star two ethnically Asian actors. And he gives his emotive all to such lines as "It is the triumph of irony that the only woman I have ever deeply loved should be born of the blood that I loathe." And in the inevitable double-death finale neither the villainess nor the noble detective can survive the machinations of Hollywood justice he gently caresses the long hair of the lady he would love to have loved. "Flower Ling Moy," he says, a moment before expiring. "A flower need not love, but only be loved. As Ah Kee loved you."
The Personal Anna May Wong
This 5'7 beauty loved to study and could speak in an English accent, as well as being fluent in German and French with more than a passing knowledge of other tongues including Italian and Yiddish. For exercise she rode horses, played golf, and tennis. She liked to cook and regaled her guests with succulent Chinese dishes at frequent dinner parties. She preferred casual clothes, wearing slacks and sweaters at home, but cultivated an oriental motif in her very smart formal wardrobe. She studied singing with Welsh tenor Parry Jones before she participated in the film Limehouse Blues as George Raft's mistress. Anna loved to dance to contemporary music. Anna was quoted as saying, "I think I got my first chance because they thought I was peculiar. But, now I like to believe that the public are fond of me because they think I'm nice."
The story of Anna May Wong’s life traced the arc of triumph and tragedy that marked so many of her films. Wong's youthful ambition and screen appeal got her farther than anyone else of her race. But her race, or rather Hollywood's and America's fear of giving Chinese and other non-whites the same chance as European Americans, kept her from reaching the Golden Mountaintop. We can be startled and impressed by the success she, alone, attained. And still weask: Who knows what Anna May Wong could have been allowed to achieve if she
had been Anna May White?
Anna May Wong passed away on Feb. 3rd 1961 she was 56 years old.
Filmography:
The Red Lantern. Metro 1919. The First Born. Robertson Cole 1921.
Shame. Fox 1921. Bits of Life. Assoc. First National 1921.
The First Born. Robertson Cole 1921. Thundering Dawn. Universal 1923
The Toll of the Sea. Metro 1922 Drifting. Universal 1923 Fifth Avenue. PRC 1926.
Lillies of the Field. Assoc. First National 1924. The Thief of Bagdad. United Artists 1924
The Fortieth Door. Pathé serial 1924. The Alaskan. Paramount 1924.
Peter Pan. Paramount 1924. Forty Winks. Paramount 1925.
The Silk Bouquet/The Dragon Horse. Hi Mark Prod. 1926 The Desert's Toll. MGM 1926.
A Trip to Chinatown. Fox 1926. The Chinese Parrot. Universal. 1927.
Driven from Home. Chadwick 1927. Mr. Wu. MGM 1927.
Old San Francisco. Warner Bros. 1927. Why Girls Love Sailors. Pathé short 1927.
The Devil Dancer. United Artists 1927. Streets of Shanghai. Tiffany 1927.
Across to Singapore. MGM 1928. Pavement Butterfly (aka City Butterfly).
The City Butterfly. German 1929. Across to Singapore. MGM 1928.
The Crimson City. Warner Bros. 1928. Song. German 1928
Chinatown Charlie. First National 1928. Piccadilly, British International 1929.
Elstree Calling. British International 1930. The Flame of Love. British International 1930.
Hay Tang. German 1930. L'Amour Maitre Des Choses. French 1930.
Daughter of the Dragon. Paramount 1931. Shanghai Express. Paramount 1932.
A Study in Scarlet. World Wide 1933. Tiger Bay. Associated British 1933.
Chu Chin Chow. Gaumont 1934. Java Head. Associated British 1934.
Limehouse Blues. Paramount 1934. Daughter of Shanghai. Paramount 1937.
Hollywood Party. MGM short subject 1937. Dangerous to Know. Paramount 1938.
The Toll of the Sea. Metro 1922. The Thief of Bagdad 1924
Shanghai Express 1932
Watercolor (American English) or watercolour (Commonwealth and Ireland), also aquarelle from French, is a painting method in which the paints are made of pigments suspended in a water-soluble vehicle. The term "watercolor" refers to both the medium and the resulting artwork. The traditional and most common support for watercolor paintings is paper; other supports include papyrus, bark papers, plastics, vellum or leather, fabric, wood, and canvas. Watercolors are usually transparent, and appear luminous because the pigments are laid down in a relatively pure form with few fillers obscuring the pigment colors. Watercolor can also be made opaque by adding Chinese white. In East Asia, watercolor painting with inks is referred to as brush painting or scroll painting. In Chinese, Korean, and Japanese painting it has been the dominant medium, often in monochrome black or browns. India, Ethiopia and other countries also have long traditions. Fingerpainting with watercolor paints originated in China.Although watercolor painting is extremely old, dating perhaps to the cave paintings of paleolithic Europe, and has been used for manuscript illumination since at least Egyptian times but especially in the European Middle Ages, its continuous history as an art medium begins in the Renaissance. The German Northern Renaissance artist Albrecht Dürer (1471–1528) who painted several fine botanical, wildlife and landscape watercolors, is generally considered among the earliest exponents of the medium. An important school of watercolor painting in Germany was led by Hans Bol (1534–1593) as part of the Dürer Renaissance.Despite this early start, watercolors were generally used by Baroque easel painters only for sketches, copies or cartoons (full-scale design drawings). Among notable early practitioners of watercolor painting were Van Dyck (during his stay in England), Claude Lorrain, Giovanni Benedetto Castiglione, and many Dutch and Flemish artists. However, Botanical illustrations and those depicting wildlife are perhaps the oldest and most important tradition in watercolor painting. Botanical illustrations became popular in the Renaissance, both as hand tinted woodblock illustrations in books or broadsheets and as tinted ink drawings on vellum or paper. Botanical artists have always been among the most exacting and accomplished watercolor painters, and even today watercolors—with their unique ability to summarize, clarify and idealize in full color—are used to illustrate scientific and museum publications. Wildlife illustration reached its peak in the 19th century with artists such as John James Audubon, and today many naturalist field guides are still illustrated with watercolor paintings. Many watercolors are more vibrant in pigment if they are higher quality. Some British market watercolors can be found in many craft stores In America and in other countries too.Materials
Paint
Watercolor paint consists of four principal ingredients:
pigments, natural or synthetic, mineral or organic;
gum arabic as a binder to hold the pigment in suspension and fix the pigment to the painting surface;
additives like glycerin, ox gall, honey, preservatives: to alter the viscosity, hiding, durability or color of the pigment and vehicle mixture; and
solvent, the substance used to thin or dilute the paint for application and that evaporates when the paint hardens or dries.
The term "watermedia" refers to any painting medium that uses water as a solvent and that can be applied with a brush, pen or sprayer; this includes most inks, watercolors, temperas, gouaches and modern acrylic paints.
The term watercolor refers to paints that use water soluble, complex carbohydrates as a binder. Originally (16th to 18th centuries) watercolor binders were sugars and/or hide glues, but since the 19th century the preferred binder is natural gum arabic, with glycerin and/or honey as additives to improve plasticity and dissolvability of the binder, and with other chemicals added to improve product shelf life.
Bodycolor refers to paint that is opaque rather than transparent, usually opaque watercolor, which is also known as gouache.[2] Modern acrylic paints are based on a completely different chemistry that uses water soluble acrylic resin as a binder.
Commercial watercolors
Watercolor painters before c.1800 had to make paints themselves using pigments purchased from an apothecary or specialized "colourman"; the earliest commercial paints were small, resinous blocks that had to be wetted and laboriously "rubbed out" in water. William Reeves (1739–1803) set up in business as a colorman about 1766. In 1781 he and his brother, Thomas Reeves, were awarded the Silver Palette of the Society of Arts, for the invention of the moist watercolor paint-cake, a time-saving convenience the introduction of which coincides with the "golden age" of English watercolor painting.
Modern commercial watercolor paints are available in two forms: tubes or pans. The majority of paints sold are in collapsible metal tubes in standard sizes (typically 7.5, 15 or 37 ml.), and are formulated to a consistency similar to toothpaste. Pan paints (actually, small dried cakes or bars of paint in an open plastic container) are usually sold in two sizes, full pans (approximately 3 cc of paint) and half pans (favored for compact paint boxes). Pans are historically older but commonly perceived as less convenient; they are most often used in portable metal paint boxes, also introduced in the mid 19th century, and are preferred by landscape or naturalist painters.
Among the most widely used brands of commercial watercolors today are Daler Rowney, Daniel Smith, DaVinci, Holbein, Maimeri, M. Graham. Reeves, Schmincke, Sennelier, Talens, and Winsor & Newton.
Thanks to modern industrial organic chemistry, the variety, saturation (brilliance) and permanence of artists' colors available today is greater than ever before. However, the art materials industry is far too small to exert any market leverage on global dye or pigment manufacture. With rare exceptions, all modern watercolor paints utilize pigments that were manufactured for use in printing inks, automotive and architectural paints, wood stains, concrete, ceramics and plastics colorants, consumer packaging, foods, medicines, textiles and cosmetics. Paint manufacturers buy very small supplies of these pigments, mill (mechanically mix) them with the vehicle, solvent and additives, and package them.
Color names
Many artists are confused or misled by labeling practices common in the art materials industry. The marketing name for a paint, such as "indian yellow" or "emerald green", is often only a poetic color evocation or proprietary moniker; there is no legal requirement that it describe the pigment that gives the paint its color. More popular color names are "viridian hue" and " chinese white"
To remedy this confusion, in 1990 the art materials industry voluntarily began listing pigment ingredients on the paint packaging, using the common pigment name (such as "cobalt blue" or "cadmium red"), and/or a standard pigment identification code, the generic color index name (PB28 for cobalt blue, PR108 for cadmium red) assigned by the Society of Dyers and Colourists (UK) and the American Association of Textile Chemists and Colorists (USA) and known as the Colour Index International. This allows artists to choose paints according to their pigment ingredients, rather than the poetic labels assigned to them by marketers. Paint pigments and formulations vary across manufacturers, and watercolor paints with the same color name (e.g., "sap green") from different manufacturers can be formulated with completely different ingredients.
Transparency
Watercolor paints are customarily evaluated on a few key attributes. In the partisan debates of the 19th-century English art world, gouache was emphatically contrasted to traditional watercolors and denigrated for its high hiding power or lack of "transparency"; "transparent" watercolors were exalted. Paints with low hiding power are valued because they allow an underdrawing or engraving to show in the image, and because colors can be mixed visually by layering paints on the paper (which itself may be either white or tinted). The resulting color will change depending on the layering order of the pigments. In fact, there are very few genuinely transparent watercolors, neither are there completely opaque watercolors (with the exception of gouache); and any watercolor paint can be made more transparent simply by diluting it with water.
"Transparent" colors do not contain titanium dioxide (white) or most of the earth pigments (sienna, umber, etc.) which are very opaque. The 19th-century claim that "transparent" watercolors gain "luminosity" because they function like a pane of stained glass laid on paper[citation needed] – the color intensified because the light passes through the pigment, reflects from the paper, and passes a second time through the pigment on its way to the viewer—is false: watercolor paints do not form a cohesive paint layer, as do acrylic or oil paints, but simply scatter pigment particles randomly across the paper surface; the transparency consists in the paper being directly visible between the particles.[3] Watercolors appear more vivid than acrylics or oils because the pigments are laid down in a more pure form with no or fewer fillers (such as kaolin) obscuring the pigment colors. Furthermore, typically most or all of the gum binder will be absorbed by the paper, preventing it from changing the visibility of the pigment.[3] Even multiple layers of watercolor do achieve a very luminous effect without fillers or binder obscuring the pigment particles.
Pigments characteristics
Staining is a characteristic assigned to watercolor paints: a staining paint is difficult to remove or lift from the painting support after it has been applied or dried. Less staining colors can be lightened or removed almost entirely when wet, or when rewetted and then "lifted" by stroking gently with a clean, wet brush and then blotted up with a paper towel. In fact, the staining characteristics of a paint depend in large part on the composition of the support (paper) itself, and on the particle size of the pigment. Staining is increased if the paint manufacturer uses a dispersant to reduce the paint milling (mixture) time, because the dispersant acts to drive pigment particles into crevices in the paper pulp, dulling the finished color.
Granulation refers to the appearance of separate, visible pigment particles in the finished color, produced when the paint is substantially diluted with water and applied with a juicy brush stroke; pigments notable for their watercolor granulation include viridian (PG18), cerulean blue (PB35), cobalt violet (PV14) and some iron oxide pigments (PBr7).
Flocculation refers to a peculiar clumping typical of ultramarine pigments (PB29 or PV15). Both effects display the subtle effects of water as the paint dries, are unique to watercolors, and are deemed attractive by accomplished watercolor painters. This contrasts with the trend in commercial paints to suppress pigment textures in favor of homogeneous, flat color.
Grades
Commercial watercolor paints come in three grades: "Artist" (or "Professional"), "Student", and "Scholastic".
Artist Watercolors contain a full pigment load, suspended in a binder, generally natural gum arabic. Artist quality paints are usually formulated with fewer fillers (kaolin or chalk) which results in richer color and vibrant mixes. Conventional watercolors are sold in moist form, in a tube, and are thinned and mixed on a dish or palette. Use them on paper and other absorbent surfaces that have been primed to accept water-based paint.
Student grade paints have less pigment, and often are formulated using two or more less expensive pigments. Student Watercolors have working characteristics similar to professional watercolors, but with lower concentrations of pigment, less expensive formulas, and a smaller range of colors. More expensive pigments are generally replicated by hues. Colors are designed to be mixed, although color strength is lower. Hues may not have the same mixing characteristics as regular full-strength colors.
Scholastic watercolors come in pans rather than tubes, and contain inexpensive pigments and dyes suspended in a synthetic binder. Washable formulations feature colors that are chosen to be non-staining, easily washable, suitable for use even by young children with proper supervision. They are an excellent choice for teaching beginning artists the properties of color and the techniques of painting.
Reserves
As there is no transparent white watercolor, the white parts of a watercolor painting are most often areas of the paper "reserved" (left unpainted) and allowed to be seen in the finished work. To preserve these white areas, many painters use a variety of resists, including masking tape, clear wax or a liquid latex, that are applied to the paper to protect it from paint, then pulled away to reveal the white paper. Resist painting can also be an effective technique for beginning watercolor artists. The painter can use wax crayons or oil pastels prior to painting the paper. The wax or oil mediums repel, or resist the watercolor paint. White paint (titanium dioxide PW6 or zinc oxide PW4) is best used to insert highlights or white accents into a painting. If mixed with other pigments, white paints may cause them to fade or change hue under light exposure. White paint (gouache) mixed with a "transparent" watercolor paint will cause the transparency to disappear and the paint to look much duller. White paint will always appear dull and chalky next to the white of the paper; however this can be used for some effects.
Brushes
A brush consists of three parts: the tuft, the ferrule and the handle.
The tuft is a bundle of animal hairs or synthetic fibers tied tightly together at the base;
The ferrule is a metal sleeve that surrounds the tuft, gives the tuft its cross sectional shape, provides mechanical support under pressure, and protects from water wearing down the glue joint between the trimmed, flat base of the tuft and the handle;
The lacquered wood handle, which is typically shorter in a watercolor brush than in an oil painting brush, has a distinct shape—widest just behind the ferrule and tapering to the tip.
When painting, painters typically hold the brush just behind the ferrule for the smoothest brushstrokes.
Hairs and fibers
Brushes hold paint (the "bead") through the capillary action of the small spaces between the tuft hairs or fibers; paint is released through the contact between the wet paint and the dry paper and the mechanical flexing of the tuft, which opens the spaces between the tuft hairs, relaxing the capillary restraint on the liquid. Because thinned watercolor paint is far less viscous than oil or acrylic paints, the brushes preferred by watercolor painters have a softer and denser tuft. This is customarily achieved by using natural hair harvested from farm raised or trapped animals, in particular sable, squirrel or mongoose. Less expensive brushes, or brushes designed for coarser work, may use horsehair or bristles from pig or ox snouts and ears.
However, as with paints, modern chemistry has developed many synthetic and shaped fibers that rival the stiffness of bristle and mimic the spring and softness of natural hair. Until fairly recently, nylon brushes could not hold a reservoir of water at all so they were extremely inferior to brushes made from natural hair. In recent years, improvements in the holding and pointing properties of synthetic filaments have gained them much greater acceptance among watercolorists.
There is no market regulation on the labeling applied to artists' brushes, but most watercolorists prize brushes from kolinsky (Russian or Chinese) sable. The best of these hairs have a characteristic reddish brown color, darker near the base, and a tapering shaft that is pointed at the tip but widest about halfway toward the root. Squirrel hair is quite thin, straight and typically dark, and makes tufts with a very high liquid capacity; mongoose has a characteristic salt and pepper coloring. Bristle brushes are stiffer and lighter colored. "Camel" is sometimes used to describe hairs from several sources (none of them a camel).
In general, natural hair brushes have superior snap and pointing, a higher capacity (hold a larger bead, produce a longer continuous stroke, and wick up more paint when moist) and a more delicate release. Synthetic brushes tend to dump too much of the paint bead at the beginning of the brush stroke and leave a larger puddle of paint when the brush is lifted from the paper, and they cannot compete with the pointing of natural sable brushes and are much less durable. On the other hand they are typically much cheaper than natural hair, and the best synthetic brushes are now very serviceable; they are also excellent for texturing, shaping, or lifting color, and for the mechanical task of breaking up or rubbing paint to dissolve it in water.
A high quality sable brush has five key attributes: pointing (in a round, the tip of the tuft comes to a fine, precise point that does not splay or split; in a flat, the tuft forms a razor thin, perfectly straight edge); snap (or "spring"; the tuft flexes in direct response to the pressure applied to the paper, and promptly returns to its original shape); capacity (the tuft, for its size, holds a large bead of paint and does not release it as the brush is moved in the air); release (the amount of paint released is proportional to the pressure applied to the paper, and the paint flow can be precisely controlled by the pressure and speed of the stroke as the paint bead is depleted); and durability (a large, high quality brush may withstand decades of daily use).
Most natural hair brushes are sold with the tuft cosmetically shaped with starch or gum, so brushes are difficult to evaluate before purchasing, and durability is only evident after long use. The most common failings of natural hair brushes are that the tuft sheds hairs (although a little shedding is acceptable in a new brush), the ferrule becomes loosened, or the wood handle shrinks, warps, cracks or flakes off its lacquer coating.
Shapes
Natural and synthetic brushes are sold with the tuft shaped for different tasks. Among the most popular are:
Rounds. The tuft has a round cross section but a tapering profile, widest near the ferrule (the "belly") and tapered at the tip (the "point"). These are general purpose brushes that can address almost any task.
Flats. The tuft is compressed laterally by the ferrule into a flat wedge; the tuft appears square when viewed from the side and has a perfectly straight edge. "Brights" are flats in which the tuft is as long as it is wide; "one stroke" brushes are longer than their width. "Sky brushes" or "wash brushes" look like miniature housepainting brushes; the tuft is usually 3 cm to 7 cm wide and is used to paint large areas.
Mops (natural hair only). A round brush, usually of squirrel hair and, decoratively, with a feather quill ferrule that is wrapped with copper wire; these have very high capacity for their size, especially good for wet in wet or wash painting; when moist they can wick up large quantities of paint.
Filbert (or "Cat's Tongue", hair only). A hybrid brush: a flat that comes to a point, like a round, useful for specially shaped brush strokes.
Rigger (hair only). An extremely long, thin tuft, originally used to paint the rigging in nautical portraits.
Fan. A small flat in which the tuft is splayed into a fan shape; used for texturing or painting irregular, parallel hatching lines.
Acrylic. A flat brush with synthetic bristles, attached to a (usually clear) plastic handle with a beveled tip used for scoring or scraping.
A single brush can produce many lines and shapes. A "round" for example, can create thin and thick lines, wide or narrow strips, curves, and other painted effects. A flat brush when used on end can produce thin lines or dashes in addition to the wide swath typical with these brushes, and its brushmarks display the characteristic angle of the tuft corners.
Every watercolor painter works in specific genres and has a personal painting style and "tool discipline", and these largely determine his or her preference for brushes. Artists typically have a few favorites and do most work with just one or two brushes. Brushes are typically the most expensive component of the watercolorist's tools, and a minimal general purpose brush selection would include:
4 round (for detail and drybrush)
8 round
12 or 14 round (for large color areas or washes)
1/2" or 1" flat
12 mop (for washes and wicking)
1/2" acrylic (for dissolving or mixing paints, and scrubbing paints before lifting from the paper)
Major watercolor brush manufacturers include DaVinci, Escoda, Isabey, Raphael, Kolonok, Robert Simmons, Daler-Rowney, Arches, and Winsor & Newton. As with papers and paints, it is common for retailers to commission brushes under their own label from an established manufacturer. Among these are Cheap Joe's, Daniel Smith, Dick Blick and Utrecht.
Sizes
The size of a round brush is designated by a number, which may range from 0000 (for a very tiny round) to 0, then from 1 to 24 or higher. These numbers refer to the size of the brass brushmakers' mould used to shape and align the hairs of the tuft before it is tied off and trimmed, and as with shoe lasts, these sizes vary from one manufacturer to the next. In general a #12 round brush has a tuft about 2 to 2.5 cm long; tufts are generally fatter (wider) in brushes made in England than in brushes made on the Continent: a German or French #14 round is approximately the same size as an English #12. Flats may be designated either by a similar but separate numbering system, but more often are described by the width of the ferrule, measured in centimeters or inches.
Watercolor pencil
Watercolor pencil is another important tool in watercolors techniques. This water-soluble color pencil allows to draw fine details and to blend them with water. Noted artists who use watercolor pencils include illustrator Travis Charest.[4] A similar tool is the watercolor pastel, broader than watercolor pencil, and able to quickly cover a large surface.
Paper
Most watercolor painters before c.1800 had to use whatever paper was at hand: Thomas Gainsborough was delighted to buy some paper used to print a Bath tourist guide, and the young David Cox preferred a heavy paper used to wrap packages. James Whatman first offered a wove watercolor paper in 1788, and the first machinemade ("cartridge") papers from a steam powered mill in 1805.
All art papers can be described by eight attributes: furnish, color, weight, finish, sizing, dimensions, permanence and packaging. Watercolor painters typically paint on paper specifically formulated for watermedia applications. Fine watermedia papers are manufactured under the brand names Arches, Bockingford, Cartiera Magnani, Fabriano, Hahnemühle, Lanaquarelle, The Langton, The Langton Prestige, Millford, Saunders Waterford, Strathmore, Winsor & Newton and Zerkall; and there has been a recent remarkable resurgence in handmade papers, notably those by Twinrocker, Velke Losiny, Ruscombe Mill and St. Armand.
Watercolor paper is essentially Blotting paper marketed and sold as an art paper, and the two can be used interchangeably, as watercolor paper is more easily obtainable than blotter and can be used as a substitute for blotter. Lower end watercolor papers can resemble heavy paper more while higher end varieties are usually entirely cotton and more porous like blotter. Watercolor paper is traditionally torn and not cut.
Furnish
The traditional furnish or material content of watercolor papers is cellulose, a structural carbohydrate found in many plants. The most common sources of paper cellulose are cotton, linen, or alpha cellulose extracted from wood pulp. To make paper, the cellulose is wetted, mechanically macerated or pounded, chemically treated, rinsed and filtered to the consistency of thin oatmeal, then poured out into paper making moulds. In handmade papers, the pulp is hand poured ("cast") into individual paper moulds (a mesh screen stretched within a wood frame) and shaken by hand into an even layer. In industrial paper production, the pulp is formed by large papermaking machines that spread the paper over large cylinders—either heated metal cylinders that rotate at high speed (machinemade papers) or wire mesh cylinders that rotate at low speed (mouldmade papers). Both types of machine produce the paper in a continuous roll or web, which is then cut into individual sheets.
Weight
The basis weight of the paper is a measure of its density and thickness. It is described as the gram weight of one square meter of a single sheet of the paper, or grams per square meter (gsm). Most watercolor papers sold today are in the range between 280gsm to 640gsm. (The previous Imperial system, expressed as the weight in pounds of one ream or 500 sheets of the paper, regardless of its size, obsolete in some areas, is still used in the United States. The most common weights under this system are 300 lb (heaviest), 200 lb 140 lb, and 90 lb.) Heavier paper is sometimes preferred over lighter weight or thinner paper because it does not buckle and can hold up to scrubbing and extremely wet washes. Watercolor papers are typically almost a pure white, sometimes slightly yellow (called natural white), though many tinted or colored papers are available. An important diagnostic is the rattle of the paper, or the sound it makes when held aloft by one corner and shaken vigorously. Papers that are dense and made from heavily macerated pulp have a bright, metallic rattle, while papers that are spongy or made with lightly macerated pulp have a muffled, rubbery rattle.
Finish
All papers obtain a texture from the mold used to make them: a wove finish results from a uniform metal screen (like a window screen); a laid finish results from a screen made of narrowly spaced horizontal wires separated by widely spaced vertical wires. The finish is also affected by the methods used to wick and dry the paper after it is "couched" (removed) from the paper mold or is pulled off the papermaking cylinder.
Watercolor papers come in three basic finishes: hot pressed (HP), cold press (CP, or in the UK "Not", for "not hot pressed"), and rough (R). These vary greatly from manufacturer to manufacturer.
Rough papers are typically dried by hanging them like laundry ("loft drying") so that the sheets are not exposed to any pressure after they are couched; the wove finish has a pitted, uneven texture that is prized for its ability to accent the texture of watercolor pigments and brushstrokes.
Cold pressed papers are dried in large stacks, between absorbent felt blankets; this acts to flatten out about half of the texture found in the rough sheets. CP papers are valued for their versatility.
Hot pressed papers are cold pressed sheets that are passed through heated, compressing metal cylinders (called "calendering"), which flattens almost all the texture in the sheets. HP papers are valued because they are relatively nonabsorbent: pigments remain on the paper surface, brightening the color, and water is not absorbed, so it can produce a variety of water stains or marks as it dries.
These designations are only relative; the CP paper from one manufacturer may be rougher than the R paper from another manufacturer. Fabriano even offers a "soft press" (SP) sheet intermediate between CP and HP.
Sizing
Watercolor papers are traditionally sized, or treated with a substance to reduce the cellulose absorbency. Internal sizing is added to the paper pulp after rinsing and before it is cast in the paper mould; external or "tub" sizing is applied to the paper surface after the paper has dried. The traditional sizing has been gelatin, gum arabic or rosin, though modern synthetic substitutes (alkyl ketene dimers such as Aquapel) are now used instead. The highly absorbent papers that contain no sizing are designated waterleaf.
Dimensions
Most art papers are sold as single sheets of paper in standard sizes. Most common is the full sheet (22" x 30"), and half sheets (15" x 22") or quarter sheets (15" x 11") derived from it. Larger (and less standardized) sheets include the double elephant (within an inch or two of 30" x 40") and emperor (40" x 60"), which are the largest sheets commercially available. Papers are also manufactured in rolls, up to about 60" wide and 30 feet long. Finally, papers are also sold as watercolor "blocks"—a pad of 20 or so sheets of paper, cut to identical dimensions and glued on all four sides, which provides high dimensional stability and portability, though block papers tend to have subdued finishes. The painter simply works on the exposed sheet and, when finished, uses a knife to cut the adhesive around the four sides, separating the painting and revealing the fresh paper underneath.
Brenizer Method Senior Portrait - 17 images shot with my Canon 85mm 1.8 @f/2.2. Images combined using Microsoft ICE.
Brenizer Method, 51 photos merged.
Canon 1000D + Canon EF 50mm f/1.8 II + Photoshop CS5
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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.
Vanilla is a flavor derived from orchids of the genus Vanilla, primarily from the Mexican species, flat-leaved vanilla (V. planifolia). The word vanilla, derived from the diminutive of the Spanish word vaina (vaina itself meaning sheath or pod), translates simply as "little pod". Pre-Columbian Mesoamerican people cultivated the vine of the vanilla orchid, called tlilxochitl by the Aztecs. Spanish conquistador Hernán Cortés is credited with introducing both vanilla and chocolate to Europe in the 1520s.
Initial attempts to cultivate vanilla outside Mexico and Central America proved futile because of the symbiotic relationship between the vanilla orchid and its natural pollinator, the local species of Melipona bee. Pollination is required to set the fruit from which the flavoring is derived. In 1837, Belgian botanist Charles François Antoine Morren discovered this fact and pioneered a method of artificially pollinating the plant. The method proved financially unworkable and was not deployed commercially. In 1841, Edmond Albius, a slave who lived on the French island of Réunion in the Indian Ocean, discovered at the age of 12 that the plant could be hand-pollinated. Hand-pollination allowed global cultivation of the plant.
Three major species of vanilla currently are grown globally, all of which derive from a species originally found in Mesoamerica, including parts of modern-day Mexico. The various subspecies are Vanilla planifolia (syn. V. fragrans), grown on Madagascar, Réunion, and other tropical areas along the Indian Ocean; V. tahitensis, grown in the South Pacific; and V. pompona, found in the West Indies, and Central and South America. The majority of the world's vanilla is the V. planifolia species, more commonly known as Bourbon vanilla (after the former name of Réunion, Île Bourbon) or Madagascar vanilla, which is produced in Madagascar and neighboring islands in the southwestern Indian Ocean, and in Indonesia. Leptotes bicolor is used in the same way in South America.
Vanilla is the second most expensive spice after saffron, because growing the vanilla seed pods is labor-intensive. Despite the expense, vanilla is highly valued for its flavor, which author Frederic Rosengarten, Jr. described in The Book of Spices as "pure, spicy, and delicate"; he called its complex floral aroma a "peculiar bouquet". As a result, vanilla is widely used in both commercial and domestic baking, perfume manufacture and aromatherapy.
HISTORY
The Totonac people, who inhabit the East Coast of Mexico in the present-day state of Veracruz, were the first to cultivate vanilla. According to Totonac mythology, the tropical orchid was born when Princess Xanat, forbidden by her father from marrying a mortal, fled to the forest with her lover. The lovers were captured and beheaded. Where their blood touched the ground, the vine of the tropical orchid grew.
In the 15th century, Aztecs invading from the central highlands of Mexico conquered the Totonacs, and soon developed a taste for the vanilla pods. They named the fruit tlilxochitl, or "black flower", after the matured fruit, which shrivels and turns black shortly after it is picked. Subjugated by the Aztecs, the Totonacs paid tribute by sending vanilla fruit to the Aztec capital, Tenochtitlan.
Until the mid-19th century, Mexico was the chief producer of vanilla. In 1819, however, French entrepreneurs shipped vanilla fruits to the islands of Réunion and Mauritius in hopes of producing vanilla there. After Edmond Albius discovered how to pollinate the flowers quickly by hand, the pods began to thrive. Soon, the tropical orchids were sent from Réunion Island to the Comoros Islands Seychelles and Madagascar, along with instructions for pollinating them. By 1898, Madagascar, Réunion, and the Comoros Islands produced 200 metric tons of vanilla beans, about 80% of world production. According to the United Nations Food and Agriculture Organisation, Indonesia is currently responsible for the vast majority of the world's Bourbon vanilla production and 58% of the world total vanilla fruit production.
The market price of vanilla rose dramatically in the late 1970s after a tropical cyclone ravaged key croplands. Prices remained high through the early 1980s despite the introduction of Indonesian vanilla. In the mid-1980s, the cartel that had controlled vanilla prices and distribution since its creation in 1930 disbanded. Prices dropped 70% over the next few years, to nearly US$20 per kilogram; prices rose sharply again after tropical cyclone Hudah struck Madagascar in April 2000. The cyclone, political instability, and poor weather in the third year drove vanilla prices to an astonishing US$500 per kilogram in 2004, bringing new countries into the vanilla industry. A good crop, coupled with decreased demand caused by the production of imitation vanilla, pushed the market price down to the $40 per kilogram range in the middle of 2005. By 2010, prices were down to US$20/per kilo.
Madagascar (especially the fertile Sava region) accounts for much of the global production of vanilla. Mexico, once the leading producer of natural vanilla with an annual yield of 500 tons, produced only 10 tons of vanilla in 2006. An estimated 95% of "vanilla" products are artificially flavored with vanillin derived from lignin instead of vanilla fruits.
ETYMOLOGY
Vanilla was completely unknown in the Old World before Cortés. Spanish explorers arriving on the Gulf Coast of Mexico in the early 16th century gave vanilla its current name. Spanish and Portuguese sailors and explorers brought vanilla into Africa and Asia later that century. They called it vainilla, or "little pod". The word vanilla entered the English language in 1754, when the botanist Philip Miller wrote about the genus in his Gardener’s Dictionary. Vainilla is from the diminutive of vaina, from the Latin vagina (sheath) to describe the shape of the pods.
BIOLOGY
VANILLA ORCHID
The main species harvested for vanilla is Vanilla planifolia. Although it is native to Mexico, it is now widely grown throughout the tropics. Indonesia and Madagascar are the world's largest producers. Additional sources include Vanilla pompona and Vanilla tahitiensis (grown in Niue and Tahiti), although the vanillin content of these species is much less than Vanilla planifolia.
Vanilla grows as a vine, climbing up an existing tree (also called a tutor), pole, or other support. It can be grown in a wood (on trees), in a plantation (on trees or poles), or in a "shader", in increasing orders of productivity. Its growth environment is referred to as its terroir, and includes not only the adjacent plants, but also the climate, geography, and local geology. Left alone, it will grow as high as possible on the support, with few flowers. Every year, growers fold the higher parts of the plant downward so the plant stays at heights accessible by a standing human. This also greatly stimulates flowering.
The distinctively flavored compounds are found in the fruit, which results from the pollination of the flower. These seed pods are roughly a third of an inch by six inches, and brownish red to black when ripe. Inside of these pods are an oily liquid full of tiny seeds. One flower produces one fruit. V. planifolia flowers are hermaphroditic: They carry both male (anther) and female (stigma) organs; however, to avoid self-pollination, a membrane separates those organs. The flowers can be naturally pollinated only by bees of the Melipona genus found in Mexico (abeja de monte or mountain bee). This bee provided Mexico with a 300-year-long monopoly on vanilla production, from the time it was first discovered by Europeans. The first vanilla orchid to flower in Europe was in the London collection of the Honourable Charles Greville in 1806. Cuttings from that plant went to Netherlands and Paris, from which the French first transplanted the vines to their overseas colonies. The vines would grow, but would not fruit outside Mexico. Growers tried to bring this bee into other growing locales, to no avail. The only way to produce fruits without the bees is artificial pollination. And today, even in Mexico, hand pollination is used extensively.
In 1836, botanist Charles François Antoine Morren was drinking coffee on a patio in Papantla (in Veracruz, Mexico) and noticed black bees flying around the vanilla flowers next to his table. He watched their actions closely as they would land and work their way under a flap inside the flower, transferring pollen in the process. Within hours, the flowers closed and several days later, Morren noticed vanilla pods beginning to form. Morren immediately began experimenting with hand pollination. A few years later in 1841, a simple and efficient artificial hand-pollination method was developed by a 12-year-old slave named Edmond Albius on Réunion, a method still used today. Using a beveled sliver of bamboo, an agricultural worker lifts the membrane separating the anther and the stigma, then, using the thumb, transfers the pollinia from the anther to the stigma. The flower, self-pollinated, will then produce a fruit. The vanilla flower lasts about one day, sometimes less, so growers have to inspect their plantations every day for open flowers, a labor-intensive task.
The fruit, a seed capsule, if left on the plant, will ripen and open at the end; as it dries, the phenolic compounds crystallize, giving the fruits a diamond-dusted appearance, which the French call givre (hoarfrost). It will then release the distinctive vanilla smell. The fruit contains tiny, black seeds. In dishes prepared with whole natural vanilla, these seeds are recognizable as black specks. Both the pod and the seeds are used in cooking.
Like other orchids' seeds, vanilla seeds will not germinate without the presence of certain mycorrhizal fungi. Instead, growers reproduce the plant by cutting: they remove sections of the vine with six or more leaf nodes, a root opposite each leaf. The two lower leaves are removed, and this area is buried in loose soil at the base of a support. The remaining upper roots will cling to the support, and often grow down into the soil. Growth is rapid under good conditions.
CULTIVARS
Bourbon vanilla or Bourbon-Madagascar vanilla, produced from V. planifolia plants introduced from the Americas, is the term used for vanilla from Indian Ocean islands such as Madagascar, the Comoros, and Réunion, formerly the Île Bourbon. It is also used to describe the distinctive vanilla flavor derived from V. planifolia grown successfully in tropical countries such as India.
Mexican vanilla, made from the native V. planifolia, is produced in much less quantity and marketed as the vanilla from the land of its origin. Vanilla sold in tourist markets around Mexico is sometimes not actual vanilla extract, but is mixed with an extract of the tonka bean, which contains coumarin. Tonka bean extract smells and tastes like vanilla, but coumarin has been shown to cause liver damage in lab animals and is banned in food in the US by the Food and Drug Administration since 1954.
Tahitian vanilla is the name for vanilla from French Polynesia, made with the V. tahitiensis strain. Genetic analysis shows this species is possibly a cultivar from a hybrid-cross of V. planifolia and V. odorata. The species was introduced by French Admiral François Alphonse Hamelin to French Polynesia from the Philippines, where it was introduced from Guatemala by the Manila Galleon trade.
West Indian vanilla is made from V. pompona grown in the Caribbean and Central and South America.
The term French vanilla is often used to designate preparations with a strong vanilla aroma, containing vanilla grains and sometimes also containing eggs (especially egg yolks). The appellation originates from the French style of making vanilla ice cream with a custard base, using vanilla pods, cream, and egg yolks. Inclusion of vanilla varietals from any of the former French dependencies or overseas France noted for their exports may in fact be a part of the flavoring, though it may often be coincidental. Alternatively, French vanilla is taken to refer to a vanilla-custard flavor. Syrup labeled as French vanilla may include custard, hazelnut, caramel or butterscotch flavors in addition to vanilla.
CHEMISTRY
Vanilla essence comes in two forms. Real seedpod extract is an extremely complicated mixture of several hundred different compounds, including vanillin, acetaldehyde, acetic acid, furfural, hexanoic acid, 4-hydroxybenzaldehyde, eugenol, methyl cinnamate, and isobutyric acid. Synthetic essence consists of a solution of synthetic vanillin in ethanol.
The chemical compound vanillin (4-hydroxy-3-methoxybenzaldehyde) is a major contributor to the characteristic flavor and aroma of real vanilla, but hundreds of compounds contribute to a complex flavor that vanillin can only approximate. Another minor component of vanilla extract is piperonal (heliotropin). Vanillin was first isolated from vanilla pods by Gobley in 1858. By 1874, it had been obtained from glycosides of pine tree sap, temporarily causing a depression in the natural vanilla industry. Vanillin can be easily synthesized from various raw materials, but the majority of food grade (>99% pure) vanillin is made from guaiacol.
PRODUCTION
GENERAL GUIDELINES
In general, quality vanilla will only come from good vines and through careful production methods. Commercial vanilla production can be performed under open field and "greenhouse" operations. Both production systems share the following similarities:
Plant height and number of years before producing the first grains
Shade necessities
Amount of organic matter needed
A tree or frame to grow around (bamboo, coconut or Erythrina lanceolata)
Labor intensity (pollination and harvest activities)
Vanilla grows best in a hot, humid climate from sea level to an elevation of 1500 m. The ideal climate has moderate rainfall, 1500–3000 mm, evenly distributed through 10 months of the year. Optimum temperatures for cultivation are 15–30 °C during the day and 15–20 °C during the night. Ideal humidity is around 80%, and under normal greenhouse conditions, it can be achieved by an evaporative cooler. However, since greenhouse vanilla is grown near the equator and under polymer (HDPE) netting (shading of 50%), this humidity can be achieved by the environment. Most successful vanilla growing and processing is done in the region within 10 to 20° of the equator.
Soils for vanilla cultivation should be loose, with high organic matter content and loamy texture. They must be well drained, and a slight slope helps in this condition. Soil pH has not been well documented, but some researchers have indicated an optimum soil pH of around 5.3. Mulch is very important for proper growth of the vine, and a considerable portion of mulch should be placed in the base of the vine. Fertilization varies with soil conditions, but general recommendations are: 40 to 60 g of N, 20 to 30 g of P2O5 and 60 to 100 g of K2O should be applied to each plant per year besides organic manures, such as vermicompost, oil cakes, poultry manure and wood ash. Foliar applications are also good for vanilla, and a solution of 1% NPK (17:17:17) can be sprayed on the plant once a month. Vanilla requires organic matter, so three or four applications of mulch a year are adequate for the plant.
PROPAGATION, PREPARATION AND TYPE OF STOCK
Dissemination of vanilla can be achieved either by stem cutting or by tissue culture. For stem cutting, a progeny garden needs to be established. Recommendations for establishing this garden vary, but in general, trenches of 60 cm in width, 45 cm in depth and 60 cm spacing for each plant are necessary. All plants need to grow under 50% shade, as well as the rest of the crop. Mulching the trenches with coconut husk and micro irrigation provide an ideal microclimate for vegetative growth. Cuttings between 60 and 120 cm should be selected for planting in the field or greenhouse. Cuttings below 60 to 120 cm need to be rooted and raised in a separate nursery before planting. Planting material should always come from unflowered portions of the vine. Wilting of the cuttings before planting provides better conditions for root initiation and establishment.
Before planting the cuttings, trees to support the vine must be planted at least three months before sowing the cuttings. Pits of 30 x 30 x 30 cm are dug 30 cm away from the tree and filled with farm yard manure (vermicompost), sand and top soil mixed well. An average of 2000 cuttings can be planted per hectare. One important consideration is that when planting the cuttings from the base, four leaves should be pruned and the pruned basal point must be pressed into the soil in a way such that the nodes are in close contact with the soil, and are placed at a depth of 15 to 20 cm. The top portion of the cutting is tied to the tree using natural fibers such as banana or hemp.
TISSUE CULTURE
Tissue culture was first used as a means of creating vanilla plants during the 1980s at Tamil Nadu University. This was the part of the first project to grow V. planifolia in India. At that time, a shortage of vanilla planting stock was occurring in India. The approach was inspired by the work going on to tissue culture other flowering plants. Several methods have been proposed for vanilla tissue culture, but all of them begin from axillary buds of the vanilla vine. In vitro multiplication has also been achieved through culture of callus masses, protocorns, root tips and stem nodes. Description of any of these processes can be obtained from the references listed before, but all of them are successful in generation of new vanilla plants that first need to be grown up to a height of at least 30 cm before they can be planted in the field or greenhouse.
SCHEDULING CONSIDERATIONS
In the tropics, the ideal time for planting vanilla is from September to November, when the weather is neither too rainy nor too dry, but this recommendation varies with growing conditions. Cuttings take one to eight weeks to establish roots, and show initial signs of growth from one of the leaf axils. A thick mulch of leaves should be provided immediately after planting as an additional source of organic matter. Three years are required for cuttings to grow enough to produce flowers and subsequent pods. As with most orchids, the blossoms grow along stems branching from the main vine. The buds, growing along the 15 to 25 cm stems, bloom and mature in sequence, each at a different interval.
POLLINATION
Flowering normally occurs every spring, and without pollination, the blossom wilts and falls, and no vanilla bean can grow. Each flower must be hand-pollinated within 12 hours of opening. In the wild, very few natural pollinators exist, with most pollination being carried out by bees of the genus Melipona.[citation needed] These pollinators do not exist outside the orchid's home range, and even within that range, vanilla orchids have only a 1% chance of successful pollination. As a result, all vanilla grown today is pollinated by hand. A small splinter of wood or a grass stem is used to lift the rostellum or move the flap upward, so the overhanging anther can be pressed against the stigma and self-pollinate the vine. Generally, one flower per raceme opens per day, so the raceme may be in flower for over 20 days. A healthy vine should produce about 50 to 100 beans per year, but growers are careful to pollinate only five or six flowers from the 20 on each raceme. The first flowers that open per vine should be pollinated, so the beans are similar in age. These agronomic practices facilitate harvest and increases bean quality. It takes the fruits five to six weeks to develop, but it takes around six months for the bean to mature. Over-pollination will result in diseases and inferior bean quality. A vine remains productive between 12 and 14 years.
PEST AND DISEASE MANAGEMENT
Most diseases come from the uncharacteristic growing conditions of vanilla. Therefore, conditions such as excess water, insufficient drainage, heavy mulch, overpollination and too much shade favor disease development. Vanilla is susceptible to many fungal and viral diseases. Fusarium, Sclerotium, Phytophthora, and Colletrotrichum species cause rots of root, stem, leaf, bean and shoot apex. These diseases can be controlled by spraying Bordeaux mixture (1%), carbendazim (0.2%) and copper oxychloride (0.2%).
Biological control of the spread of such diseases can be managed by applying to the soil Trichoderma (0.5 kg) per plant in the rhizosphere) and foliar application of pseudomonads (0.2%). Mosaic virus, leaf curl and cymbidium mosaic potex virus are the common viral diseases. These diseases are transmitted through the sap, so affected plants must be destroyed. The insect pests of vanilla include beetles and weevils that attack the flower, caterpillars, snakes and slugs that damage the tender parts of shoot, flower buds and immature fruit, and grasshoppers that affect cutting shoot tips. If organic agriculture is practiced, insecticides are avoided, and mechanical measures are adopted for pest management. Most of these practices are implemented under greenhouse cultivation, since such field conditions are very difficult to achieve.
ARTIFICIAL VANILLA
Most artificial vanilla products contain vanillin, which can be produced synthetically from lignin, a natural polymer found in wood. Most synthetic vanillin is a byproduct from the pulp used in papermaking, in which the lignin is broken down using sulfites or sulfates. However, vanillin is only one of 171 identified aromatic components of real vanilla fruits.
The orchid species Leptotes bicolor is used as a natural vanilla replacement in Paraguay and southern Brazil.
NONPLANT VANILLA FLAVORING
In the United States, castoreum, the exudate from the castor sacs of mature beavers, has been approved by the Food and Drug Administration (FDA) as a food additive, often referenced simply as a "natural flavoring" in the product's list of ingredients. It is used in both food and beverages, especially as vanilla and raspberry flavoring. It is also used to flavor some cigarettes and in perfume-making.
STAGES OF PRODUCTION
HARVEST
The vanilla fruit grows quickly on the vine, but is not ready for harvest until maturity - approximately six months. Harvesting vanilla fruits is as labor-intensive as pollinating the blossoms. Immature dark green pods are not harvested. Pale yellow discoloration that commences at the distal end of the fruits is an indication of the maturity of pods. Each fruit ripens at its own time, requiring a daily harvest. To ensure the finest flavor from every fruit, each individual pod must be picked by hand just as it begins to split on the end. Overmatured fruits are likely to split, causing a reduction in market value. Its commercial value is fixed based on the length and appearance of the pod.
If the fruit is more than 15 cm in length, it belongs to first-quality product. The largest fruits greater than 16 cm and up to as much as 21 cm are usually reserved for the gourmet vanilla market, for sale to top chefs and restaurants. If the fruits are between 10 and 15 cm long, pods are under the second-quality category, and fruits less than 10 cm in length are under the third-quality category. Each fruit contains thousands of tiny black vanilla seeds. Vanilla fruit yield depends on the care and management given to the hanging and fruiting vines. Any practice directed to stimulate aerial root production has a direct effect on vine productivity. A five-year-old vine can produce between 1.5 and 3 kg pods, and this production can increase up to 6 kg after a few years. The harvested green fruit can be commercialized as such or cured to get a better market price.
CURING
Several methods exist in the market for curing vanilla; nevertheless, all of them consist of four basic steps: killing, sweating, slow-drying, and conditioning of the beans.
KILLING
The vegetative tissue of the vanilla pod is killed to stop the vegetative growth of the pods and disrupt the cells and tissue of the fruits, which initiates enzymatic reactions responsible for the aroma. The method of killing varies, but may be accomplished by heating in hot water, freezing, or scratching, or killing by heating in an oven or exposing the beans to direct sunlight. The different methods give different profiles of enzymatic activity.
Testing has shown mechanical disruption of fruit tissues can cause curing processes,[40] including the degeneration of glucovanillin to vanillin, so the reasoning goes that disrupting the tissues and cells of the fruit allow enzymes and enzyme substrates to interact.
Hot-water killing may consist of dipping the pods in hot water (63–65 °C) for three minutes, or at 80 °C for 10 seconds. In scratch killing, fruits are scratched along their length. Frozen or quick-frozen fruits must be thawed again for the subsequent sweating stage. Tied in bundles and rolled in blankets, fruits may be placed in an oven at 60 °C for 36 to 48 hours. Exposing the fruits to sunlight until they turn brown is a method originating in Mexico that was practiced by the Aztecs.
SWEATING
Sweating is a hydrolytic and oxidative process. Traditionally, it consists of keeping fruits, for seven to 10 days, densely stacked and insulated in wool or other cloth. This retains a temperature of 45–65 °C and high humidity. Daily exposure to the sun may also be used, or dipping the fruits in hot water. The fruits are brown and have attained much of the characteristic vanilla flavor and aroma by the end of this process, but still retain a 60-70% moisture content by weight.
DRYING
Reduction of the beans to 25–30% moisture by weight, to prevent rotting and to lock the aroma in the pods, is always achieved by some exposure of the beans to air, and usually (and traditionally) intermittent shade and sunlight. Fruits may be laid out in the sun during the mornings and returned to their boxes in the afternoons, or spread on a wooden rack in a room for three to four weeks, sometimes with periods of sun exposure. Drying is the most problematic of the curing stages; unevenness in the drying process can lead to the loss of vanillin content of some fruits by the time the others are cured.
CONDITIONING
Conditioning is performed by storing the pods for five to six months in closed boxes, where the fragrance develops. The processed fruits are sorted, graded, bundled, and wrapped in paraffin paper and preserved for the development of desired bean qualities, especially flavor and aroma. The cured vanilla fruits contain an average of 2.5% vanillin.
GRADING
Once fully cured, the vanilla fruits are sorted by quality and graded.
Several vanilla fruit grading systems are in use. Each country which produces vanilla has its own grading system, and individual vendors, in turn, sometimes use their own criteria for describing the quality of the fruits they offer for sale.
In general, vanilla fruit grade is based on the length, appearance (color, sheen, presence of any splits, presence of blemishes), and moisture content of the fruit. Whole, dark, plump and oily pods that are visually attractive, with no blemishes, and that have a higher moisture content are graded most highly. Such pods are particularly prized by chefs for their appearance and can be featured in gourmet dishes. Beans that show localized signs of disease or other physical defects are cut to remove the blemishes; the shorter fragments left are called “cuts” and are assigned lower grades, as are fruits with lower moisture contents. Lower-grade fruits tend to be favored for uses in which the appearance is not as important, such as in the production of vanilla flavoring extract and in the fragrance industry.
Higher-grade fruits command higher prices in the market. However, because grade is so dependent on visual appearance and moisture content, fruits with the highest grade do not necessarily contain the highest concentration of characteristic flavor molecules such as vanillin, and are not necessarily the most flavorful.
USAGE
CULINARY USES
There are four main commercial preparations of natural vanilla:
- whole pod
- powder (ground pods, kept pure or blended with sugar, starch, or other ingredients)
- extract (in alcoholic or occasionally glycerol solution; both pure and imitation forms of vanilla contain at least 35% alcohol)
- vanilla sugar, a pre-packaged mix of sugar and vanilla extract
Vanilla flavoring in food may be achieved by adding vanilla extract or by cooking vanilla pods in the liquid preparation. A stronger aroma may be attained if the pods are split in two, exposing more of a pod's surface area to the liquid. In this case, the pods' seeds are mixed into the preparation. Natural vanilla gives a brown or yellow color to preparations, depending on the concentration. Good-quality vanilla has a strong aromatic flavor, but food with small amounts of low-quality vanilla or artificial vanilla-like flavorings are far more common, since true vanilla is much more expensive.
A major use of vanilla is in flavoring ice cream. The most common flavor of ice cream is vanilla, and thus most people consider it to be the "default" flavor. By analogy, the term "vanilla" is sometimes used as a synonym for "plain". Although vanilla is a prized flavoring agent on its own, it is also used to enhance the flavor of other substances, to which its own flavor is often complementary, such as chocolate, custard, caramel, coffee, cakes, and others.
The food industry uses methyl and ethyl vanillin. Ethyl vanillin is more expensive, but has a stronger note. Cook's Illustrated ran several taste tests pitting vanilla against vanillin in baked goods and other applications, and, to the consternation of the magazine editors, tasters could not differentiate the flavor of vanillin from vanilla; however, for the case of vanilla ice cream, natural vanilla won out. A more recent and thorough test by the same group produced a more interesting variety of results; namely, high-quality artificial vanilla flavoring is best for cookies, while high-quality real vanilla is very slightly better for cakes and significantly better for unheated or lightly heated foods.
It was once believed that the liquid extracted from vanilla pods had medical properties, helping with various stomach ailments.
WIKIPEDIA