[argyllcms] Re: Conversion omitting/locking device colorant

Roger wrote:

Are you trying to use the gray balance press calibration method through a
standard characterization chart, like ECI2002? If you do, don't forget to
use the 40m 40y for the Lab to CMY look up. This is the method advocated by
Heidelberg and is now carried into their Near Neutral Calibration Utility.


Roger,
        I'm not familiar with the details of such methods, but the above
doesn't sound correct if a specific Lab is targeted. There is
only one degree of freedom left for CMYK, and if K is set to zero,
then there are no degrees of freedom left to set an M or Y value.
Even if K was left unconstrained, there is not enough degrees of
freedom left to set both an M and Y value.

> I'd wish for Argyll to also calculate some curves ...

It's not clear to me what sort of curves you are after...

Graeme Gill.

Other related posts: