I'm currently looking to move from LCMS 1 to LCMS 2 however the significant
changes regarding "advanced" usage are making it a bit difficult. As such I'm
wondering if there's an LCMS 1 to LCMS 2 transition guide, particularly
regarding advanced usage. I've looked through the docs and mailing list
archives and really can't find much on how to move from LCMS 1 to 2 for
advanced uses. Does there exist such a guide? If so please point me to it. ;-)
As I can't find such a guide I'll just start asking questions. Although things
do appear to have changed significantly it does look like a lot of
functionality can still be done with the new API, however there also seems to
be a lot of omissions (ex: the matrix & vector functions but those are
available via lcms2_plugin.h). Here's a list of some LCMS 1 functions that I
can't find equivalents for in LCMS 2 as well as a few functions and what I
understand to be their equivalents in LCMS 2 - please correct me if I'm wrong:
LCMS1:
cmsTakeIluminant(LPcmsCIEXYZ Dest, cmsHPROFILE hProfile);
cmsBuildRGB2XYZtransferMatrix(LPMAT3 r, LPcmsCIExyY WhitePoint,
LPcmsCIExyYTRIPLE Primaries);
LCMS2:
Unknown
LCMS1:
cmsTakeColorants(LPcmsCIEXYZTRIPLE Dest, cmsHPROFILE hProfile);
LCMS2:
cmsCIEXYZ cRed, cGrn, cBlu;
cRed = *(cmsCIEXYZ *)cmsReadTag( hProfile, cmsSigRedColorantTag );
cGrn = *(cmsCIEXYZ *)cmsReadTag( hProfile, cmsSigGreenColorantTag );
cBlu = *(cmsCIEXYZ *)cmsReadTag( hProfile, cmsSigBlueColorantTag );
LCMS1:
cmsCIEXYZ whitePoint;
cmsTakeMediaWhitePoint( &whitePoint, hProfile );
LCMS2:
cmsCIEXYZ whitePoint = *(cmsCIEXYZ *)cmsReadTag( hProfile,
cmsSigMediaWhitePointTag );
I see that there is a _cmsBuildRGB2XYZtransferMatrix in lcms2_internal.h - why
isn't this included in the public interface?
The only other significant change that's causing troubles is the move from
GAMMATABLEs to cmsToneCurve, but that looks like it should be fairly
straightforward.
Cheers
--
Dave Thorup
Senior Software Engineer
http://bibblelabs.com
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