[argyllcms] Re: Question about DeltaE from printread and one about iccexamin/profcheck

  • From: Kai-Uwe Behrmann <ku.b@xxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 11 Sep 2007 07:45:06 +0200 (CEST)

Am 11.09.07, 11:14 +1000 schrieb Graeme Gill:

> Lars Tore Gustavsen wrote:
 
> > However icc_examin gives me this result for the profile:
> > averaging deviations (dE CIE*Lab): 36.5161 maximum: 67.1216 minimum:
> > 0.739298 (dE CIE 2000) averaging: 14.9649 maximum: 21.93 minimum:
> > 0.670952
> > and patch 6
> > dE Lab dE2000
> > 46.638 12.9499
> > Take a look at  http://www.mulebakken.net/div/iccexamin.html for a
> > more readable  cutted down iccexamin report for row F only.
> 
> Sorry, I'm not familiar with icc_examin. I'd take a look
> at Gerhard's suggestion about RGB scaling. Argyll adopts the
> consistent convention of device values being percentages from
> 0-100, while many other packages assume binary numbers for
> RGB devices as a special case.

Indeed, I looked at some available samples from other profiling packages, 
like PM and L-Prof, and found, the RGB 0...255 range where used for 
obvious reasons. As well the #17 draft speaks explicitely about that range 
for RGB. Did you run a different profiling package with argyll's 
measurements, for instance L-Prof?
Nethertheless a exception to argyll measurements should fix this 
difference.

Gerhard and Lars,
thanks for pointing out this case.

kind regards
Kai-Uwe Behrmann
--
developing for colour management 
www.behrmann.name + www.oyranos.org + www.cinepaint.org


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