Re: Chromix ColorThink not using chromatic adaptation tag for plotting monitor profiles (?)
Re: Chromix ColorThink not using chromatic adaptation tag for plotting monitor profiles (?)
- Subject: Re: Chromix ColorThink not using chromatic adaptation tag for plotting monitor profiles (?)
- From: Roger Breton <email@hidden>
- Date: Wed, 20 Jul 2005 00:31:26 -0400
> [The above couple of comments are really about the changes to the ICC spec.
> and the practical consequences that have flowed from that, rather than a
> comment
> about ColorThink.]
>
> Graeme Gill.
Thank you Graeme for coming on with these thoughts about the meaning of
absolute gamut mapping in the context of screen display. I know I'd like
someday to have a way to choose how I want images white point to be adapted
on my monitor when the need to display them arises. So that if, for example,
I choose to display a D65 white point image on a D50 calibrated monitor then
I'd like to have the option of seeing the image come up with its distinctive
blue cast, unequivocally signaling me the true colorimetric nature of the
image. Then it's up to me to decide how I want to act on the appearance of
that image: a) leave it alone, knowing that after a while, my cones will
have 'adapted' to the blue white point, or b) change my monitor calibration
accordingly (which should come up to the same as displaying the image
absolute white point natively). Conversely, if my monitor is D65 calibrated
and I want to display a D50 white point image on it then that image should
logically appear yellowish on my screen. If I decide I don't want to see it
in this absolute, true light, then I'll just reach for some friendly control
labeled "display images with PCS adapted white" and everything will look
"normal". I think that would promote a huge awareness to color appearance,
all of a sudden, among users. Or would it? Come to think of it, that would
depend on the frequency of 'white point mismatch' between whathever white
point calibration and images reference white. I know some shops that
strictly adhere to AdobeRGB in all their digital capture and their screen
calibration. To them that situation would never be a problem. But then when
they send images to me, who works on a D50 or 'native' white calibration
what's going to happen?
I realize it's a complicated business but I always found that the reality of
"absolute" appearance should not be concealed from the user. Everyone ought
to start from the same "asbolute reference point" and then decide how to
move on in life. Calibration is calibraition is calibration, there is no
getting away from it.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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