[Openicc] Scarse Profile Library Warning

Kai-Uwe Behrmann ku.b at gmx.de
Mon Nov 21 04:28:33 PST 2011


over the weekend I looked at the Scarse library profiles and found 
some colorimetric fine and several flawed profiles.

Most prominently the sRGB (simplified) has a strong gamma problem. This is 
normal for profiles which do not use the sRGB curve. This one assumes a 
simple gamma of 2.2, which results in some deltaE´s in mainly dark areas.

An other prominent one is the AdobeRGB of the Scarse collection. It showed 
in my tests a very strong blue cast with the relative colorimetric intent. 
The absolute intent was fine. This profile is not any longer available 
online but may be present in several packages. Please switch to the Argyll 
AdobeRGB replacement profile.

Colorimetric fine where WideGamutRGB and AppleRGB. The later one might 
have importance only for historic material. The colorimetric primaries are 
not 100% as the original but inside the typical ICC format precision, 
which is fine.

ColorMatch had more serious divergine color primaries, which caused some 
deltaE´s. The same for ProPhoto, which I compared with the ROMM profile 
from ICC website.

The reference profiles, which I used for the test, where implemented by 
littleCMS and Adobe.

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

Am 16.11.11, 17:56 +0100 schrieb Kai-Uwe Behrmann:
> Am 16.11.11, 05:34 -0800 schrieb Andrei Frolov:
>> On 2011-11-16, at 4:04, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
>>> Claudio Wilmanns [2] revealed today a colorimetric imprecision inside the 
>>> Scarse WideGamutRGB profile. Norman Koren [3] hinted that the Scarse 
>>> profiles do not pass a profile validation tool. OpenICC could never verify 
>>> these profiles or how they where build and therefore did not cover any of 
>>> them in its icc-profiles-openicc data set.
>>> [2] 
>>> http://lists.color.org/pipermail/icc_users/Week-of-Mon-20111114/000682.html

More information about the openicc mailing list