[argyllcms] Re: Creating process calibration curves

  • From: Klaus Karcher <lists@xxxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sun, 01 Feb 2009 21:05:04 +0100

Martin Weberg wrote:
Device K needed to meet L* of target K (iterative user input):
icclu -ff -ia -s100 Device_Profile.icc

On Tue, Jan 27, 2009 at 09:41, Klaus Karcher wrote:
you could also use xicclu -fif -kx instead of iteratively searching for the
appropriate K value:

xicclu -fif -kx -ia -s100 Device_Profile.icc

I'll try that, thank you.

I guess it will work well as long as your paper and black chromaticities
are close to the aim values -- otherwise there can be significant abouts
of C, M or Y in the xicclu -fif result (You can avoid at least the paper
tint issues by using the relative colorimetric intent when necessary).

The xicclu -fif -kx result can be useful anyway: It helps to narrow down
the interval for the iterative search: when xicclu -fif returns c, m, y
and k, one can assume that the sought-after K value is in the interval
[k ... k + max(c,m,y)].

Another approach would be to invert a K -> L table extracted from your
measurements or calculated with icclu.

Klaus


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