Thomas Lunzer wrote:
> Thank you for the quick reply. I get your thougt for the first step
> when you create the device link, this one is not usable for icc2ps -right?

Yes.

> Then you use icclink from lcms which does n o t create a device link,
> instead it creates a kind of smelted profile out of the formerly
> created device link and again the RGB input profile.

Lcms' icclink has an option "-x" to tag a generated CIELAB -> CMYK (or
RGB) device link not as device link profile but as output profile (which
is of course just a "castrated" output profile, containing only a B2A
table, but no A2B table - but this is sufficient ot make icc2ps happy).

> So the conversion chain amounts to RGB > RGB > CMYK, where RGB > RGB
> ideally should not change the result. Did I get your idea right or is
> there a mistake in my thoughts?

The transformation of the resulting output profile is eventually CIELAB
-> RGB -> CMYK (but the RGB intermediate step is hidden).

E.g.

$ argyll_icclink -f -kx -G -ip sRGB.icm ISOcoated.icc link.icc
$ lcms_icclink -x -o output.icc -t1 -c2 *Lab sRGB.icm link.icc
$ icc2ps -o output.icc > ISOcoated_K_only_CRD.ps

Regards,
Gerhard


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