Chris Murphy vs Bruce Fraser
Chris Murphy vs Bruce Fraser
- Subject: Chris Murphy vs Bruce Fraser
- From: Mauro Boscarol <email@hidden>
- Date: Thu, 13 Jul 2006 19:45:28 +0200
Hi all.
I have collected two quotations from ColorSync mailing list:
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On Jun 14, 2005, at 7:51 PM, Chris Murphy wrote:
ACE in the CS2 applications ignores a non-D50 wtpt tag in display
profiles. Editing/intermediate spaces are display profiles and until
ICC spec v4 it was rather vague how to handle them. v4 says that
display profiles always have a D50 wtpt tag. If the actual white
point isn't D50 then the primaries get chromatically adapted to D50,
and the chromatic adaptation tag is required so that it's possible to
reverse the chromatic adaptation used.
On Apr 27, 2006, at 6:22 PM, Bruce Fraser wrote:
Photoshop CS doesn't do absolute conversions between matrix profiles
of type 'mntr' (which includes all the working spaces) because the
feedback from users has pointed out that 99% of the time an absolute
conversion such as the one you're doing is operator error. [I suppose
Bruce refers to CS2]
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I think the two are the same.
Perhaps the way Adobe used to inibite absolute conversions between
matrix profiles of class 'mntr' (as Bruce writes) is to ignore a non-
D50 wtpt tag in display profiles (as Chris writes). So all
colorimetric conversions are relative (and absolute colorimetric is
not possible). So far OK.
But motivations are far apart: Bruces motivation is operator error,
Chris motivation is adherence to v4 ICC specifications.
Any comment?
Thank you.
Mauro Boscarol
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