[argyllcms] Re: Conversion omitting/locking device colorant

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.

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