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.