Hi Michal, This is a bug in the curve inversion when curves are not starting in zero, as it happens in that profile. If affects only the first value, zero in this case. Now is fixed.
Thanks for reporting. Regards Marti Quoting Michal Soltys <sol...@ziu.info>: > While experimenting a bit with 2.0's transicc I noticed one thing that > kinda surprised me. When using no-bpc sRGB v2 profile downloaded from > www.color.org (sRGB_IEC61966-2-1_no_black_scaling.icc). If I do > invocation such as: > > transicc.exe -v3 -t1 -i srgb.icc -o srgb.icc > > For RGB = 0,0,0 I get: > > R=1.1868 G=1.1868 B=1.1868 > [PCS] Lab=(10.9189,0.0044,-0.0040) XYZ=(1.2051,1.2497,1.0311) > > But for RGB = 1,1,1: > > R=1.0078 G=1.0078 B=1.0078 > [PCS] Lab=(11.1362,0.0044,-0.0040) XYZ=(1.2345,1.2802,1.0563) > > While PCS values seem fine, the output RGB for 0,0,0 seems a bit off and > the values are actually bigger than for 1,1,1. > > If I choose any other intent, the final effect is precisely the same - I > guess that's expected considering the contents of this profile. > > Is it due to inaccuracy of the profile data, or is there perhaps > something else (during pcs -> output profile step) that would cause > those 1.1868 values ? > > sRGB v4 (although quite different internally, with AtoB and BtoA tags) > gives more expected results with analogous invocation (for 0,0,0 and > 1,1,1 respectively): > > R=-0.3043 G=-0.0087 B=0.0021 > [PCS] Lab=(10.9194,0.0195,-0.0078) XYZ=(1.2056,1.2497,1.0314) > > R=0.7644 G=1.1842 B=1.0450 > [PCS] Lab=(11.1360,0.0039,0.0039) XYZ=(1.2345,1.2802,1.0557) > > > ------------------------------------------------------------------------------ > Download new Adobe(R) Flash(R) Builder(TM) 4 > The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly > Flex(R) Builder(TM)) enable the development of rich applications that run > across multiple browsers and platforms. Download your free trials today! > http://p.sf.net/sfu/adobe-dev2dev > _______________________________________________ > Lcms-user mailing list > Lcms-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lcms-user > ------------------------------------------------------------------------------ Download new Adobe(R) Flash(R) Builder(TM) 4 The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly Flex(R) Builder(TM)) enable the development of rich applications that run across multiple browsers and platforms. Download your free trials today! http://p.sf.net/sfu/adobe-dev2dev _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
