Re: Weird Color Behavior?
Re: Weird Color Behavior?
- Subject: Re: Weird Color Behavior?
- From: Steve Upton <email@hidden>
- Date: Fri, 20 Feb 2004 16:30:06 -0800
At 1:46 PM -0500 2/20/04, Roger Breton wrote:
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> In a message dated 2/20/04 12:24:20 PM, email@hidden writes:
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>
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>> But there's
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>> a rub, in both of these instances, Phothsop *won't* display the grayscale
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>> differently?
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> Your profile does not have video card corrections in it, as its not really a
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> monitor profile. So its only defining white, gamma, and color primaries; and
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> leaving gray balance to a tag that is missing.
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>
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> C David Tobie
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I should have made clear that I was aware of this limitation. But what I am
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getting at is that even with the VCGT in Photoshop will not display the
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white point differently. If my monitor is calibrated for D65 and I display a
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ColorMatch image the appearance of R=G=B=255 is the same as if my monitor is
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calibrated for D50 or 9300K. Yes, the appearance of R=G=B=255 is different
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under the three calibration because, phusically, the monitor will have
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different chromaticities for the different target white point. But my
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"point" is Photoshop is not managing the white point absolutely.
right, that's because Photoshop displays colors to the screen in relative colorimetric form. So it assumes you have calibrated your display to a certain white point (something which the VCGT tag should maintain across restarts). Then it's job is to adapt colors to the new white point. Document white will display at your monitor's white point and other colors will adapt relative to that white point.
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IOW, if I
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display a ColorMatch image onto a 9300K calibrated monitor I'd like to have
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some indication that this image looks yellowish as opposed to bluish.
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Currently, Photoshop is ignoring the image white point altogeher on the way
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to the display, it justs maps whathever image white point to whathever
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monitor calibrated white point in a relative fashion. And that's what I find
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weird. But maybe it's just me ;-)
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!
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
________________________________________________________________________
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