Martin Weberg wrote:
What I'm trying to do is a grey balance control strip to be used in offset printing. I want to use K=25, 50 and 75% along with the corresponding absolute colorimetric CMY color.
Ah - perhaps you should have mentioned that initially :-) If you set the right -k option (ie. xicclu -fif -kv), then the fourth number is the target K value, so if the color is in gamut, the K target will be met exactly, ie: ./xicc/xicclu -kv -fif cmyk.icm 50 0 0 0 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.571222 0.465793 0.503049 0.000000 [CMYK] 50 0 0 .5 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.213566 0.155089 0.190922 0.500000 [CMYK] 50 0 0 1 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.029284 0.000000 0.038167 0.594197 [CMYK] thereby possibly avoiding the need to create a separate CMY profile. cheers, Graeme Gill.