Hi Richard,
|9.2.1 |AToB0Tag |Tag signature: ‘A2B0’ (41324230h) |Permitted tag types: lut8Type or lut16Type or lutAToBType The spec allows to store old-style LUT, the Lab encoding of those tags is still V2, but there are subtle variations V2/V4 like for example the non-zero black point of V4 perceptual PCS, the reference gamut and so. I think it is not generally safe to include V2 tags in a V4 profile. It should be converted somehow. Regarding the use of proprietary tags, I would not do that because compatibility issues. If Photoshop does not read the profile, people would complain about the profile, not Photoshop (for example) Regards Marti El 31/03/2013 12:49, Richard Hughes escribió: > Hey list, another question. > > When building, colord uses colprof to generate the common CMYK > profiles, e.g. FOGRA30L and ISOnewspaper26 from ti3 source data. > colprof can only create V2 profiles unless I'm mistaken. > After colord has finished, colord then opens the created file, and > then inserts some translated description, copyright and profile > description using three mluc tags. To insert the mluc tag as the > description, colord has to call cmsSetProfileVersion(hProfile,4.0) so > that we can write some type other than 'desc' for the description. > > Is this okay to change a CMYK profile from V2 to V4 just to write a > 'mluc' key? I'm fine shipping v4 profiles as all the RGB profiles are > v4 only. I could use the newly introduced > cmsSigProfileDescriptionMLTag which Apple uses for V2 profiles with > translated descriptions and avoid changing the version although this > really isn't standard. Advice welcome. Thanks. > > Richard. > > ------------------------------------------------------------------------------ > Own the Future-Intel(R) Level Up Game Demo Contest 2013 > Rise to greatness in Intel's independent game demo contest. Compete > for recognition, cash, and the chance to get your game on Steam. > $5K grand prize plus 10 genre and skill prizes. Submit your demo > by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 > _______________________________________________ > Lcms-user mailing list > Lcms-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lcms-user > ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
