There seems to be a special case with linear gamma icc profiles which causes tonecurves to become 16 bit tables even for floating point math which leads to precision loss. In normal applications this is not detected as it is buried in deep shadows, but in HDR it is.
To me this seems to be a bug. More detailed analysis can be found in this issue report for rawtherapee (which uses lcms2), which also includes a suggested bug fix by patching cmstypes.c: http://code.google.com/p/rawtherapee/issues/detail?id=1642 (lots of discussion, read the last comments and up to get to the point immediately). If there is a workaround that does not require patching lcms2 please let me know. /Anders ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
