> I'm trying to match Adobe's color conversions for a UI we are building.
Why not ColorSync, or the SampleICC reference implementation? These have small differences with ACE as well...
> Are all CMS theoretically suppose to output the same results when the same input and output ICC profiles are being used?
Theoretically yes. In practical, all have small differences in some values. The color you are talking about is on gamut boundary of sRGB and probably out of SWOP gamut (see the 100% of Yellow). Maybe ACE is using some special algorithm for those colors. The interpolation may also make a difference on boundaries (trilinear vs. tetrahedric)
Regards Marti El 22/07/2013 20:17, Alexander W. Rolek escribió:
I agree visually the impact is minimal. I'm trying to match Adobe's color conversions for a UI we are building. I think it might have to do with Adobe's (ACE) engine being used. Are all CMS theoretically suppose to output the same results when the same input and output ICC profiles are being used?On Mon, Jul 22, 2013 at 8:58 AM, <marti.ma...@littlecms.com <mailto:marti.ma...@littlecms.com>> wrote:Hi, I really don't know about those differences. I've checked lcms2 against Graeme Gill's argyll and also against SampleICC, all we agree on same value, but Adobe slighly differ. I wonder what kind of secret sauce they are using. Visually, the impact is minimal. Regards Marti Quoting "Alexander W. Rolek" <a.ro...@gmail.com <mailto:a.ro...@gmail.com>>: I have been trying to match the color conversions of Adobe Illustrator's color picker using the transicc tool, but I just can't seem to get them perfect. I found the .icc profiles that Adobe is using, and matched the settings under Illustrator's Color Settings. I have been using the following command: echo 224 62 0 | transicc -i RGB\ Profiles/sRGB\ Color\ Space\ Profile.icm -o CMYK\ Profiles/USWebCoatedSWOP.icc -t 1 -b -n My output is: LittleCMS ColorSpace conversion calculator - 4.2 [LittleCMS 2.05] 5.9434 90.2419 100.0000 0.8774 Adobe Illustrator displays the CMYK as: 7% 90% 100% 1% It's very close, with Cyan being the farthest off. What setting am I missing in order to achieve perfection? -- Alexander W. Rolek -- Alexander W. Rolek 303-829-9989
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