View allAll Photos Tagged badpixel
Leg of a fly - Fliegenbein - Perna da mosca.
The fly was at the end of its life cycle, already very lame and not trying to escape anymore. It just was hanging on the edge of a leaf in the foreground. The body color of this fly was already almost white, same color as the head. Is that kind of a fungus? Even like this the fly was still pretty clean, nearly no dust and dirt on the body and wings!
This is uncropped on a Olympus micro four thirds E-PL2 sensor. Lens was «Auto Bellows Macro Noflexar 1:4/60» on a fully extended Novoflex bellows system for Canon FD. Distance from lens nodal point to sensor was about 175mm. Aperture was around 8-11, Iso 400. A little bit of ambient light (overcast, shadow, 1/100s) & main light from pop-up camera flash with home made diffuser to bring the light to the front of the lens. Camera bellows & diffuser hand held.
This is converted from .ORF (Olympus raw) with Photivo, an excellent raw converter and editor. Automatic CA correction, Green equilibration, Badpixel reduction, VNG 4 color algorithm with 2 median passes & 2 edge sensitive median passes. Exposure, whitepoint & white balance corrected, sigmoidal contrast aplied, texture contrast applied, color saturation corrected, defringed, USM sharpened, OOF CA corrected with saturation curve, vignette aplied. All done within Photivo. Resized by Flickr.
Demonstration of a bad pixel and a streak on a Therm-App image.
This is way worse than you would normally expect to see: I have emphasised both issues for the purpose of demonstration.
Bad pixels are common to practically all thermal imagers and are usually fairly invisible because they are 'mapped out' by the driver software. It usually simply repeats a neighbouring pixel, in the hope that it will be 'near enough'. More sophisticated algorithms use averaging techniques. Here we can see a bad pixel that has taken the value of the one above it and, thanks to the way I positioned the camera, it appears as a small blob below the line.
The streak is an entirely different phenomenon and there is no consensus (yet) as to what causes it. The effect is that an entire column is displaced down (or up) by one or more pixels. It's normally hard to notice unless you're panning across something with strong (near-) horizontal lines.
This image was made at 2.5x magnification, which strongly emphasised the defects, and then re-sized using the incredibly useful waifu2x.udp.jp/ . I set the image up carefully to show the effects at their worst - I repeat, you're unlikely to see anything like as bad as this in real-life use.
CHDK now writes DNG files right out of the camera for the A590 IS. Thanks, guys!
Left side: Canon jpg, ISO 100 with “My Colors” set to “off”.
Right side: CHDK DNG straight from the camera, opened in PS CS3. All I did was click a white balance target - no other adjustments were made by me (Adobe RAW does do some sharpening by default).
Check out the edge detail! (original)
Special thanks to James W. Manning for explaining the creation of the “badpixel.bin” file in this thread: www.flickr.com/groups/canonpowershots5is/discuss/72157610...
I designed, printed large scale and framed this to give as a secret santa/home warming gift to a friend of mine when he moved into his home. Inspiration is clearly the big backlit signs in the beginning of each test chamber in the game Portal.
All information on the poster are relevant to his home. No. 2 is the his street number. /08 of eight houses in the street, and all custom warning signs are related to the house.
As I had mentioned on my website/blog thing some time ago, I designed Nicosia's bid for European Capital of Culture 2017.
On Dec 22, 2011 Nicosia passed to the second selection stage.
This shot was ISO 200 with a 1 second exposure. I had to do some processing to make them all show so well. But there are 16 bad pixels here, not counting the light leak in the left corner. I marked the most annoying red one near the middle with a larger box. That is the only one I have ever cloned out in my photos. Luckily though, it seems to have gone away. The rest aren't noticeable with shorter exposures and ISO that I normally shoot at.
I suggest don't go looking for bad pixels since everyone will probably find at least a few and be disappointed. All digital cameras have them or develop them over time. There are different types of bad pixels, hot pixels and dead pixels. Hot pixels may not always show up depending on temperature, exposure length, and ISO. Some come out in color, some white, and I think some can be black. And some only show up in longer exposures. Higher ISOs can bring them out too.
Unless they are right in the middle and/or visible in all your shots, they aren't a big problem. They won't affect prints and aren't visible on screen unless you view at greater than 100%.
Unless you have a lot of bad pixels, Canon's repair solution is probably to have the camera remap the dead pixels. Some cameras can be programmed to ignore the bad ones in creating the photo. Some DSLRs have that function built in. That was one of the first things I did when I got my Sony A350 because even brand new it had a few bad ones. (Canon replaced my sensor instead of remapping so I don't know if that is possible with the S5)
If they are annoying you and especially if you have any other problems with your camera, I would send it in. But check whether bad pixels are covered under warranty. My one year warranty is about up so mine will be making the trip to Canon soon. My orientation sensor has been strange since I first got it, but I never wanted to be without it. And it could certainly use a cleaning. Now that I have the SLR I can stand to be without it for a while.
M31, 12x7 mins, EQ120 at f/5 with Baader Contrast Booster filter. QHY8 camera with Baader UV/IR cut filter and Nebulosity2. BadPixel map in Neb2, aligned, combined and Digital Development in ImagesPlus. Finished in PSCS2.
Very Happy My Picture is Published In Nicosia 2017 The Bid
issuu.com/badpixel/docs/nicosia2017phase2english?fb_actio...
As I had mentioned on my website/blog thing, I designed Nicosia's bid for European Capital of Culture 2017.
Unfortunately on Sept 14 Nicosia didn't make it as European Capital of Culture for Cyprus in 2017. Congratulations to Paphos.
Tabs, aka Roo, with the SX10, Canon 430EX II flash, CHDK.
This is promising. This is the SX10 running CHDK. Instead of my usual DNG raw format, I selected the CRW raw format and developed the file with the RAWHide Converter (Adobe doesn't support the CRW format, apparently). This was properly exposed and focused, which certainly helps, but the detail and color are quite beautiful, especially considering the camera is a four year old point-and-shoot.
I don't know if I'll do this all the time. I upgraded CHDK to get the DNG 1.3 version, which doesn't require the badpixel.bin file, which has been giving me some headaches in the form of black spots on my photos. That problem is also gone, but, obviously, it's another step to process the CRW files before processing them again in Lightroom.
Thanks, keno2010!
Better known as the Pelican nebula in Cygnus. EQ120 refractor at f/5 and QHY8 camera with UHC_S filter.18x 6 minute subs, Bias, Flats and BadPixel map in Nebulosity2. Aligned and combined in ImagesPlus and finshed in PSCS2. Still have trouble with getting the best out of these 16bit images.
I took these pictures under different conditions, documenting my possible bad pixel. Guess it's getting time for a new camera, mine is 6 years old. I have used it heavily. The problem only shows up in medium and low light situations. Man! It makes me wanna scream, I wanna crush it! Im gonna get carpal tunnel syndrome from using the clone brush! Not sure if I can afford to buy a real digital SLR at this time. I like my fuji, think I'll get the 9 megapixel upgrade and hold off on the Real Deal for now.
This is my first effort at doing a layer mask in PhotoShop. Ten 240-sec RAW and 10 180-sec RAW images using a Canon 1000D (unmodified) were captured at ISO800. The camera was attached to my 90-mm, f6.7 APO refractor fitted with an Astro Tech field flattener and Orion Skyglow LPF. The two sets of images were stacked separately using Nebulosity 1.8 with badpixel subtraction and then combined. A third set of images (10 20-sec RAW) were stacked and processed in Nebulosity and the region around the Trapesium was copied and layered into the main image using a radial gradient with PhotoShop 7.
NGC7023, the Iris nebula in Cepheus. EQ120 at f/5 with QHY8 and Baader UV/IR filter. 10x6min BadPixel Map in Nebulosity and processed in ImagesPlus and PSCS2.
Early morning working from home. Decided to give b&w a go again. This time using the blue filter to expose all the imperfections on my face. Not only did I expose every pore on my face, I also found a couple of bad pixels in the sensor. :-/
My annual look at the Orion Nebula. Ten 240-sec RAW images using a Canon 1000D (unmodified) were captured at ISO800. The camera was attached to my 90-mm, f6.7 APO refractor fitted with an Astro Tech field flattener and Orion Skyglow LPF. The images were stacked using Nebulosity 1.8 with badpixel subtraction. Final processing was done in PhotoShop 7.
Please keep your hands where we can see them.
GRFlickr Photo walk Thursday night downtown Grand Rapids with a dozen or more photographers.
We only lost a few on the front lines.
The North America nebula and Pelican. Canon 200mm lens at f/2.8 and QHY8 camera with 7nm Ha filter. 15x7 minutes, bias, flats and badpixel map. Taken and part processed with Nebulosity2, aligned and combined in ImagesPlus, finished in PSCS2. This is the full image.
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