Hi, today have ported the lcms 1.16/1.17 Python bindings through ctypes mostly to the lcms 2.0 preview. Some things are different, and I had to skip some other things, but in general it worked quite well.
Some things that I have noticed, in no particular order of importance: * I had to modify my unit tests quite a bit with regards to test colour conversions. lcms2 produced often significantly different colour conversion results than lcms1. These were particularly obvious in the extreme values, which could be considered out of gamut. But especially those corner values are important for unit testing, that's why I have used them, and kept them. Is this anticipated, that these have changed so significantly due to a different algorithm for the colour conversion? * lcms2_plugin.h: Why does the struct _cms_interp_struc also have the name cmsInterpParams? To me one would be less confusing ... * lcms2_plugin.h: _cms_interp_struc contains a reference to cmsInterpFunction. cmsInterpFunction contains references to _cmsInterpFn16 and _cmsInterpFnFloat. The last two (_cmsInterpFn16 and _cmsInterpFnFloat) contain references back to _cms_interp_struc forming a ring. Is this intended? Under the current architecture for Python ctypes I cannot map such dependency rings. * I can map the before mentioned only by breaking the ring and (most sensibly) not mapping the contents of cmsInterpFunction, therefore not exposing the possible interpolation functions for 16 bit and floats. * How is the access to ICC (header) information handled in lcms2? That is the former cmsTakeProduct*() functions (e. g. cmsTakeProductName()). Some observations of functions that seem to be gone missing or not implemented (yet). I don't worry much about them, but I couldn't find anything from the lcms1 samples to make them work on lcms2. * I couldn't find any equivalent to the cmsClampLab() function anymore. * Support for CIECAM97 seems to be dropped. * The function cmsEstimateGamma() seems to be gone. Any comments or opinions? Guy -- Guy K. Kloss Institute of Information and Mathematical Sciences Te Kura Pūtaiao o Mōhiohio me Pāngarau Room 2.63, Quad Block A Building Massey University, Auckland, Albany Private Bag 102 904, North Shore Mail Centre voice: +64 9 414-0800 ext. 9585 fax: +64 9 441-8181 eMail: g.kl...@massey.ac.nz http://iims.massey.ac.nz ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
