[argyllcms] Re: targen options

Graeme,

thanks for the explanation and also for the references to
the two papers. At the first moment I was a bit confused
why the issues discussed in the paper should be related to
the problem to generate test patches, but now I clearly see
that the problems are similar.

Btw, I get astonishingly good results for my laser printer,
even with as few as 250..300 CMYK patches on the target :-)
(-> pretty neutral looking grayscale, even if I use "-kh"
and not "-kx"). Of course I must admit, the threshold arrays
of the halftone screens seem to be pretty well linearized,
such that the profile is smooth.

On the other hand, I'm having trouble with my inkjet (-> RGB
driver, only 3 dgrees of freedom, which should require fewer
patches than CMYK) to get a neutral looking gray axis, though
I'm using much more patches. A soft proof looks fine, but in
the print, the patches of a gray staircase have color casts,
not a particular trend into one directon, but into different
[a,b] directions at different lightness levels. I've attempted
to manually add additional patches near the gray axis, but
only with very moderate success. Since I have no other
explanation, I suspect that this driver has highly curved
"corcscrew" characteristics. Assuming that my suspicion is
true, do you see any reasonable way to build a profile which
"unwinds" the corcscrew for such a weird device bahaviour?

Regards,
Gerhard

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