Hi Jason (Wasn't this already answered?) Ok, there is no easy way to do that and maybe there is no way at all. ICC profiles does not keep the GCR algorithm, but rather a sort of "cooked" table that describes how to go from the PCS to CMYK. That means, only from Lab/XYZ to CMYK, with no clue about what was the black generation or the ink limiting used to generate this table.
There are advanced algorithms that by using the AToB direction can undo some of this information, but this implies a reverse 4D interpolation and only works if the input and output directions does have same resolution. That is not the usual case. So the short answer is, you can't do that. It is a limitation of ICC color management, not of the lcms library. Regards Marti > I am looking for a way to take a profile that was made as a CMYK (GCR K > generation) and get just CMY lookups from Lab input values... Right now, > if I give it a Lab, I will get appropriate K generation as expected. > However, I need to backfigure just the CMY build (essentially undoing the K > generation)... I had tried in the past (and asked here) about using the > TYPE_CMY_16 conversion, but it fails since it must check that the profile > was CMYK!? Anyhow, could one access the GCR curve data and basically > 'undo' the K that is returned from the CMYK output values? > > > ------------------------------------------------------------------------------ > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > _______________________________________________ > Lcms-user mailing list > Lcms-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lcms-user > ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
