Weird Color Behavior?
Weird Color Behavior?
- Subject: Weird Color Behavior?
- From: Roger Breton <email@hidden>
- Date: Fri, 20 Feb 2004 12:18:31 -0500
This is going to sound crazy, and it probably is (?). But just for the sake
of argument, and maybe to clear out some confusion, when one creates a
custom RGB profile, in Photoshop, I see that this custom RGB profile is
recognized by OSX Displays Preferences as a perfectly valid monitor profile.
And, indeed, it is listed in the Displays Preferences Color pane among all
the other monitor profiles found by the system in both the Users and Library
folders. Fine. So, I figure, these custom RGB Photoshop's profiles are a
blank check for experimentation ;-)
Here's what I discovered. If, for instance, I decide to set the white point,
in a custom RGB Photoshop profile, to illuminant A (2856K) then when
Photoshop sees the corresponding profile, loaded by the system as the
current 'monitor' profile, it immediately shifts all colors around, to
compensate for the yellowish white point of what it believes is a very
yellow calibrated monitor. Assume I have an sRGB image currently loaded in
Photoshop. OK. Now, if I decide to set the white point, again in second
custom RGB profile, to 9300K, I get the same kind of behavior from Photoshop
when Photoshop recognizes this custom RGB profile as the new 'monitor'
profile. This time, all colors shift wildly around to compensate for what
Photoshop believe is a very bluish calibrated monitor. Logical. But there's
a rub, in both of these instances, Phothsop *won't* display the grayscale
differently?
Bug? Limitation? Oversight? ICC interpretation?
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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