[argyllcms] Re: How is delta E calculated in colprof?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 19 Jul 2012 23:53:56 +1000
Stephen T wrote:
> Both of the above are consistent but colprof's delta E values are different
> and do not match
> DE76 and DE94 either.
Hi,
do you have a specific example ?
> Which delta E is colprof reporting? The documentation states only that "a
> summary of the average
> and maximum Lab delta E's will be printed out if this flag [-y] is set".
There is no qualification, so this is plain delta E (ie. Euclidean distance).
It's
open source, so you can always look at the source code...
> Is colprof applying any weighting to the DE00 calculation: KL, KC, KH not
> equal to 1.0?
Again, it's open source - it's easy enough to check, and it's noted in the
source that the equations are taken from:
"The CIEDE2000 Color-Difference Formula: Implementation Notes,
Supplementary Test Data, and Mathematical Observations", by
Gaurav Sharma, Wencheng Wu and Edul N. Dalal,
Color Res. Appl., vol. 30, no. 1, pp. 21-30, Feb. 2005.
Graeme Gill.
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