Re: Color difference equations [was: Color Measurement]
Re: Color difference equations [was: Color Measurement]
- Subject: Re: Color difference equations [was: Color Measurement]
- From: Todd Shirley <email@hidden>
- Date: Thu, 16 Jul 2009 11:49:13 -0400
One problem is I don't think any standards or specifications have been
rewritten to use dE2000. As far as I know ISO 12647-7 tolerances for
certifying proofs are still expressed in dE76 and all the IdeaAlliance
hardproofing certifications are expressed in dE76 tolerances as well.
So while I fully agree that dE2000 has a much better correlation with
human perception, you've still got to beat those dE76 tolerances if
you want to create a "certified" proof. As soon as dE2000 is
incorporated into accepted internationaL standards, I hope everybody
will just forget about dE76. As it is, dE76 IS the "tough one",
because it is the "official" one.
Interestingly, IdeAlliance's monitor proofing certification DOES use
dE2000, which kind of does look a little like cheating because the max
tolerance for primaries is dE2000<7, which is just large enough to
include how most sRGB monitors display pure cyan. On my Eizo CG210,
pure cyan has a dE2000 of about 6 but dE76 of around 18! I'd argue
that both those numbers are too ridiculously large to be certifying
anything, but if the tolerance were more realistic, nobody would be
able to have a "certified" soft proof system.
-Todd Shirley
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