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Is a Kodak gray card a "known" value in terms of RGB numbers? Through the years, I have had various Kodak gray cards, and many of them looked a lot darker/lighter than the others. Maybe they changed color inside a light proof envelope – I don’t know.
But, I often do color correction using a 3 color card – black, white, and gray. The black and white are pretty good – black velvet, and ultra bright inkjet paper. But, the Kodak gray area is hard to evaluate.
Is there such a thing as a calibrated gray card, where the RGB values are a known quantity?
With my 3 color card, using channels, I can color correct most any off-color image where the card was present in the image. I can actually get by not knowing the real RGB of the gray, but I’d like to do things as carefully as I can.
Ron Hirsch
But, I often do color correction using a 3 color card – black, white, and gray. The black and white are pretty good – black velvet, and ultra bright inkjet paper. But, the Kodak gray area is hard to evaluate.
Is there such a thing as a calibrated gray card, where the RGB values are a known quantity?
With my 3 color card, using channels, I can color correct most any off-color image where the card was present in the image. I can actually get by not knowing the real RGB of the gray, but I’d like to do things as carefully as I can.
Ron Hirsch
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