Hello Gerhard,
thanx again for the clarifying help. I omitted the -x flag, that's why
it didn't work.
Now erverything works better than I expected. Only -ip yields a very
muddy yellow for
RGB 0 255 255. (about 12 % C, 83%Y). although Photoshop ACE gives 1% C,
83%Y for perceptual intent.
Using -ila or -ir yields just about the same like PS for Yellow. This
is much more pleasing for printing business
graphics like out of office programs.
Regards
Thomas
Gerhard Fuernkranz schrieb:
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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