RE: Re Gamma, dithering and device calibration
RE: Re Gamma, dithering and device calibration
- Subject: RE: Re Gamma, dithering and device calibration
- From: bruce fraser <email@hidden>
- Date: Sun, 4 Aug 2002 12:39:42 -0700
At 3:49 PM -0230 8/4/02, michael shaffer wrote:
Although I threw the post away, I believe he did ask (2nd part of his
query) why resampling is not with respect to gamma. That is ... it would
imply that if you were to resample 2 identical images, 'cept that one was in
Colormatch and the other in AdobeRGB, you'd end up with different colors
because both are simple numeric averages but are contextually in different
tonal spaces. That is, averaging the tones is different than averaging the
numeric values ... UNLESS you are in gamma=1.0 space (... hopefully not
raising a corollary to the "Timo" argument ...)
A great many operations in Photoshop simply work on the numbers --
Levels, Curves, USM, and resampling, for example, will all produce
identical numerical results irrespective of the gamut or gamma of the
working space. The meaning and the appearance of those numerical
values is tied to the working space, but the actual numerical
operations are not.
Bruce (not Lindbloom, who knows way more about this stuff than I do!)
--
email@hidden
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