Am 27.05.26 um 14:11 schrieb Jan Ulrich Hasecke via ntg-context:
Am 27.05.26 um 07:10 schrieb Henning Hraban Ramm:
I’d generally suggest to leave CMYK conversion to the printshop and
use PDF/X-4 with properly profiled images. But there are too many
printshops that are >20 years behind in their workflow…
What does "properly profiled images" mean?
That they must have a color profile embedded or at least defined, if
it’s a standard profile like sRGB. Only this way the colors are defined
in the L*a*b color space and can be converted reliably.
Profiled RGB images are usually a better source (in a properly
configured color management workflow) than CMYK images, even profiled
ones. There are exceptions, if you want to define fixed CMYK values
regardless of the output device or if you want to control the method of
color conversion (black composition via GCR or UCR…).
Hraban
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