Nikolay Pokhilchenko wrote:
Nikolay Pokhilchenko wrote:V1.1.0_RC1, Windows Vista: When calibrating an RGB-printer, it's impossible to achieve the "darkest" black R=B=G=0 in the calibration result if the printcal have select the other limits. Even if I use "-x r 100", "-x g 100" and "-x b 100" keys. Try my printer example attached. The workflow: targen -v -d2 -f0 -m0 -e9 -s274 Lin printtarg -v -ii1 -A0.6 -a0.8 -m0 -L -T360 -p240x225 Lin chartread -v -a Lin printcal -v -p -i -x r 100 -x g 100 -x b 100 Lin If You try "printcal -v -p -i Lin", the curves will be the same. If I print the next targets by printtarg with -K"Lin.cal" function, the R=G=B=0 output TIFF level isn't achievable. So there is heavy gamut restriction from the black side.In RC2 The problem is still here. Even with 100% user channel limits in printcal, the printtarg result didn't translate R=B=G=0 to zeros. For example, the RGB=0,0,0 after printtarg with calibration become 0,21,0. It's heavy restriction for RGB-printer gamut. So printcal for RGB printer is useless. The problem is in printcal itself. The example device profile (one A2B only) is attached.
Sorry, I can't reproduce this. I'm using fakeread instead of printtarg/chartread, but even using a couple of different RGB printer profiles in fakeread, I get calibration curves that go fro, 0 to 100%, and produce subsequent profile charts that have R=B=G=0 for black. Perhaps you had better send me your Lin.ti3 file ? Graeme Gill.