Evaluation of Color Difference Formulas
Evaluation of Color Difference Formulas
- Subject: Evaluation of Color Difference Formulas
- From: Klaus Karcher <email@hidden>
- Date: Thu, 19 Jul 2007 14:04:01 +0200
Maybe I'm about to start another flame war (even though this is not my
primary intention ;), but I stumbled across the
following web page:
<http://www.aim-dtp.net/aim/evaluation/cie_de/index.htm>
The Author of the page, Timo Autiokari, suggests and demonstrates that
every commonly used color difference formula (including CIEDE2000) fails
terribly and systematically in typical monitor viewing conditions as it
underestimates the perceived lightness difference.
I know that some members of this and other lists/newsgroups blame Timo
to be obstinate and unscientific (e.g.
<http://lists.apple.com/archives/colorsync-users/2002/Feb/msg00437.html>),
but I am missing a lucid explanation what's wrong with his theses.
Or is he just right? -- and what we call a "softproof" is simply nonsense?
I played around with CIECAM02-based Color difference equations to see if
anything becomes better, but had no success until now.
The only formula I found that seems to perform significantly better in
some cases is the one based on the rarely known DIN 99 colorspace.
For details about DIN 99 see
<http://www.engl.dfwg.de/doc/dfwg homepage engl-499.htm>
and <http://www.dfwg.de/doc/dfwg-homepage-419.htm> (German)
Related discussion in sci.engr.color (approving colour standards):
<http://tinyurl.com/yo9kfl>
I'm looking forward to your comments,
Klaus Karcher
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