Peter,
There is no "perfect" way to measure color differences, hence
there are different approaches.
cmsDeltaE : This is the "classical" dE, is just the euclidean distance
in Lab space. Widely used in industry, but less accurate in terms
of human vision.
cmsBFDdeltaE, cmsCMCdeltaE: Used in textile and some other
specialized applications. Don't use those unless you really need
such standards.
cmsCIE94DeltaE: That's good. Was based mainly on RIT-DuPont
dataset. Is simple enough to be either useful and meaningful.
Is not so accurate as dE2000, but still a way better than dE
cmsCIE2000DeltaE: That is recommended by CIE as the
most accurate one, but a word of warning: Fist it is very complex,
you need additional parameters. Alas, it works in a highly
tweaked space, and that has amazing side effects, like distance
from a to b is not same as distance from b to a. Handled with care
performs great, but is not easy. Only for the brave.
My advice would be to use both, dE and dE94, in conjunction.
Also, those metrics are intended only for *small* differences, a
dE of 30 or more has no meaning at all, since refers to very
different colors.
Regards,
--
Marti Maria
The littlecms project.
www.littlecms.com
----- Original Message -----
From: "infisys" <[EMAIL PROTECTED]>
To: "Lcms Liste" <lcms-user@lists.sourceforge.net>
Sent: Thursday, June 30, 2005 1:28 PM
Subject: [Lcms-user] delta E questions
Hello everybody,
I am try to do a deltaE for a inkjet proofing project but really do
not know much about which function to use. I check the function
headers and below are following choices,
double cmsCIE94DeltaE(LPcmsCIELab Lab1, LPcmsCIELab Lab2);
double cmsBFDdeltaE(LPcmsCIELab Lab1, LPcmsCIELab Lab2);
double cmsCMCdeltaE(LPcmsCIELab Lab1, LPcmsCIELab Lab2);
double cmsCIE2000DeltaE(LPcmsCIELab Lab1, LPcmsCIELab Lab2, double
Kl, double Kc, double Kh);
Which one should I use ?
Thanks in advance.
Peter.
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