Hello list..
If I understand v4 specs (and related documents) correctly, perceptual intent in v4 profiles should re-render to PRMG (at profile build time, so generated LUTs take into account intermediate reference gamut), or at the very least scale white and black points to PRM's white and black (and then "cooked" to D50 illuminant, as in relative colorimetric approach). But, for example if I execute (with v4 profile downloaded from http://www.color.org/srgbprofiles.xalter): icctrans -v -w -t0 -i sRGB_v4_ICC_preference.icc Then for RGB=0,0,0 - the PCS values are all 0 (and considering PRMG's black point - they shouldn't be ?). I also tested the above with -t1, and I'm not really sure what to make out of both PCS and destination profile values: icctrans -v -w -t1 -i sRGB_v4_ICC_preference.icc R=29.21 G=29.28 B=29.23 X=1.2054 Y=1.2512 Z=1.0315 L*=10.9191 a*=-0.0312 b*=0.0117 L* looks rather extensive for a PCS value, and RGB in destination (internal sRGB) profile seems to follow it. On the other hand - XYZ values seem perfectly fine. Anyway - some hints of what I'm missing or misunderstanding would be welcome (icctrans from lcms 1.18a). ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
