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#1
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Remember film grain?
No one (except in the case of something like 1600-3200 ASA colour
or Tri-X) ever cared much about graininess. So if substantial noise is impossible to get rid of in a digital image, why isn't there some kind of software program that could "convert" the digital noise so it had the consistency of film grain? From an aesthetic point of view, it might even be acceptable. -Rich |
#2
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In message ,
RichA wrote: No one (except in the case of something like 1600-3200 ASA colour or Tri-X) ever cared much about graininess. So if substantial noise is impossible to get rid of in a digital image, why isn't there some kind of software program that could "convert" the digital noise so it had the consistency of film grain? From an aesthetic point of view, it might even be acceptable. Try upsampling to about 300%, and then run the PS "diffuse" filter a few times. This will make the shape of the pixels and the noise a little more complex. I often do this to get rid of pixelation in low-PPI prints. The center of the deformed pixel blobs will still be pretty much the original center, though. What would be better yet is some kind of filter that arbitrarily misplaced the center of the pixels, sort of like arbitrarily extending some of the upsized pixels in various directions, and shrinking the remainder; IOW, make the sizes of the original pixels vary, and offset their centers, to get rid of the gridding. A large, very complex grid mesh for the liquid filter might accomplish this. This distorts the noise and the image. If you just want to distort noise, to be more grainlike, you may as well remove the noise and start from scratch, or subtract the denoised image from the original, if you want to work with the original noise. I don't think there's anything particularly desireable about sensor or digitization noise, myself. -- John P Sheehy |
#3
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http://www.gsnsoft.com/df/en/index.html
"RichA" wrote in message ... No one (except in the case of something like 1600-3200 ASA colour or Tri-X) ever cared much about graininess. So if substantial noise is impossible to get rid of in a digital image, why isn't there some kind of software program that could "convert" the digital noise so it had the consistency of film grain? From an aesthetic point of view, it might even be acceptable. -Rich |
#4
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RichA wrote:
No one (except in the case of something like 1600-3200 ASA colour or Tri-X) ever cared much about graininess. Not true... if the neg has grain, when making large prints it is always important to make sure the grain is sharp, expecially in the print's corners. Anything less looked very sloppy. So if substantial noise is impossible to get rid of in a digital image Not true, ISO 1600~3200 digital noise is easily reduced to very tolerable levels with many programs, some of them free. Even the worst digital noise can be minimized to a level an old film shooter would feel is better than bad grain. why isn't there some kind of software program that could "convert" the digital noise so it had the consistency of film grain? Digital noise appears the reverse of film grain, because usually it is apparent only in the dark areas; film grain is more objectionable in the light areas of an image. The consistency you want is a quality step backward, if you're shooting digital. From an aesthetic point of view, it might even be acceptable. Generations of film photographers happily accepted grain as the price of speed, so there's no reason why digital noise should not be equally acceptable for its own particular texture. Each medium has its own pros and cons... one does not fault an oil painting for being thick and "lumpy" in comparison to a flat watercolor. From the aesthetic point of view, I often prefer a bit of digital noise to give a certain flatness and paper-like "tooth" to an image, unlike the 3-D slickness associated with ferrotyped prints -- Anti-Spam address: my last name at his dot com Charles Gillen -- Reston, Virginia, USA |
#5
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