Re: Weird Color Behavior?
Re: Weird Color Behavior?
- Subject: Re: Weird Color Behavior?
- From: bruce fraser <email@hidden>
- Date: Sat, 21 Feb 2004 12:11:11 -0800
Document white is always displayed as monitor white, and all other
colors are adapted to monitor white. This is as it should be.
If you could look at an sRGB document directly, without the
intervention of the monitor, you'd see sRGB's 6500K as white.
If you then looked directly at a ProPhoto RGB document, you'd see
PPRGB's 5000K as white, because your eye automatically does white
point adaptation.
An imaging system that displayed Colormatch as yellow and Adobe RGB
as blue simply wouldn't be useful for anything except showing you how
colorimeters and spectrophotometers would see the image. If your work
is destined for human eyeballs, you want Photoshop to take account of
human white point adaptation...
Bruec
At 8:33 AM -0500 2/21/04, Roger Breton wrote:
> Document white will
display at your monitor's white point and other colors will adapt
relative to
that white point.
You mean that only the document white is left untouched but all the other
color displayed are adapted?
well, I guess it's you <g> It would be weird if Adobe RGB had a white point
that appeared blue on displays that were calibrated to 5000K don't
you think?
Abs col out of a working space rarely results in satisfied users!
No, I agree with you and probably everybody else on this list and elsewhere
on Usenet that there is hardly a need to convert AbsCol out of AdobeRGB or
sRGB to US WebCoated SWOP v2, for example! But, come to think of it, I would
expect Photoshop to show a blue white for an AdobeRGB or sRGB document when
displayed a 5000K calibrated monitor, and conversely to show a yellow white
for a ColorMatchRGB document when displayed on a 6500K calibrated monitor.
Only when the document white point would match the monitor calibrated white
then there should not be any difference because the source and destination
are the same, giving something like a null transform. At the very least, I'd
like to have the option, perhaps under Proof Setup to see an absolute
conversion from working space to the display space.
I don't know about your experience but, at my end, when I introduce the
concept of color temperature in the context of monitor calibration and its
implication for displaying RGB working spaces, because Photoshop ignores
white point absolute matching to the screen, people just don't get it
intuitively, because, well, there is no difference to the screen!
And, no, I beg to differ, it's not just me after all. I am not alone in
thinking that Photoshop does not handle the document white point to the
screen correctly. But I respect your opinion and appreciate all your help
and time and I don't think I'll ever see the day where Adobe's engineers
will ever implement that option in Photoshop v35...
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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