On 09/11/2014 06:32 PM, marti.ma...@littlecms.com wrote: > > > Hi Elle, > > Sorry, with the profiles you sent and transicc from lcms2-2.6, this does > not happen. I got the expected values. > Please check the version of lcms2 you are using. > > BTW, -c0 is not needed in lcms2 and may cause problems. This may be the > source of the issue in versions previous to 2.6 > > M:\lcms2-2.6\bin>transicc -c0 -t1 -w -o sRGB-V2-g10.icc -i sRGB-V4-g20.icc > LittleCMS ColorSpace conversion calculator - 4.2 [LittleCMS 2.06] > > Enter values, 'q' to quit > R? 255 > G? 0 > B? 0 > > R=255.0000 G=0.0000 B=-0.0000 > > Enter values, 'q' to quit > R? 255 > G? 255 > B? 0 > > R=255.0000 G=255.0000 B=0.0000 > > Enter values, 'q' to quit > >
Hi Marti, Thanks! for checking. I tried with and without "-c0", running LCMS2 versions 2.5, 2.6 and from git on my 64-bit Gentoo box. I also checked on a 32-bit OpenSuse machine and a 32-bit Arch Linux machine. Results were identical in all cases. The near-zero and zero channel values aren't converting correctly. Could our different results be from running different platforms? I don't have access to an Apple or Windows machine. As a check I tried converting a 16-bit tiff with a gradient running from red to black, zero in the green and blue channels, from linear gamma to gamma=2.0 versions of sRGB, using cctiff, tifficc, and tificc. Upon opening the converted tiffs with GIMP from git and color picking across the gradients, the cctiff and tifficc gradients were still zero in the green and blue channels, all across the gradient. But the tificc version had green channel values between 0 and 10, and blue channel values between 0 and 3, flipping randomly as the red channel value changed (not proportional to the red channel value). Elle ------------------------------------------------------------------------------ Want excitement? Manually upgrade your production database. When you want reliability, choose Perforce Perforce version control. Predictably reliable. http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
