On 9 Sep 2017, at 08:08, Graeme Gill <graeme2@argyllcms.com> wrote:
colprof -v -qm -kz fogra52
icclu -fb -ia fogra52.icc 100.0 0.0 0.0 [Lab] -> Lut -> 0.007017 0.000764 0.081098 0.000000 [CMYK](clip) 50.0 0.0 0.0 [Lab] -> Lut -> 0.606688 0.510562 0.654812 0.000731 [CMYK] 40.0 0.0 0.0 [Lab] -> Lut -> 0.695956 0.650859 0.853761 0.179810 [CMYK] 30.0 0.0 0.0 [Lab] -> Lut -> 0.791740 0.543053 0.444419 0.844733 [CMYK] 20.0 0.0 0.0 [Lab] -> Lut -> 0.998257 0.923926 0.930881 0.996716 [CMYK] 10.0 0.0 0.0 [Lab] -> Lut -> 0.994710 0.972349 0.899008 0.998990 [CMYK] 0.0 0.0 0.0 [Lab] -> Lut -> 0.983620 1.000000 0.915429 1.000000 [CMYK]
what exactly are you looking for ?
Yellow in separations with increased K generation :) In profiles I made using Argyll in March this year I was getting this from -kx 300 TAC 60.000000 0.000000 0.000000 [Lab] -> Lut -> 0.042220 0.021155 0.138908 0.493434 [CMYK] 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.082952 0.039821 0.172168 0.656604 [CMYK] 30.000000 0.000000 0.000000 [Lab] -> Lut -> 0.703806 0.399562 0.299396 0.917587 [CMYK] 20.000000 0.000000 0.000000 [Lab] -> Lut -> 0.910211 0.696531 0.426875 0.996719 [CMYK] 10.000000 0.000000 0.000000 [Lab] -> Lut -> 0.932469 0.806219 0.293490 0.998988 [CMYK] 0.000000 0.000000 0.000000 [Lab] -> Lut -> 1.000000 0.864791 0.135001 1.000000 [CMYK] But, more importantly, this is what you actually get from relative conversions: 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.103877 0.046326 0.000000 0.712330 [CMYK] 30.000000 0.000000 0.000000 [Lab] -> Lut -> 1.000000 0.531888 0.077466 0.945821 [CMYK] 0.000000 0.000000 0.000000 [Lab] -> Lut -> 1.000000 0.864791 0.135001 1.000000 [CMYK] And perceptual has NO yellow whatsoever! 50.000000 0.000000 0.000000 [Lab] -> Lut -> 0.078745 0.037454 0.000000 0.635533 [CMYK] 30.000000 0.000000 0.000000 [Lab] -> Lut -> 0.265519 0.116809 0.000000 0.776893 [CMYK] 0.000000 0.000000 0.000000 [Lab] -> Lut -> 1.000000 0.549650 0.000000 0.922678 [CMYK] -- Martin Orpen Idea Digital Imaging Ltd