Have you tried overprint=yes? I have that in old files which used to work under mkii. I must admit I haven't had the need to use overprinting since then, but I do recall that come colour handling wasn't ported across to mkiv or later. Duncan On Wed, 9 Nov 2022 at 16:12, Henning Hraban Ramm via ntg-context < ntg-context@ntg.nl> wrote:
I’m not sure if this ever worked, but at least in latest LMTX it doesn’t:
""" \setupcolors[state=start,cmyk=yes,rgb=no,intent=overprint]
\starttext
\framed[ background=color, backgroundcolor=yellow, ]{\ss\bfd Black should always overprint. }
\stoptext """
The black text and frame border don’t overprint the yellow background but knockout. The only way to check this (that I know of) is Acrobat Pro’s separation simulation; the screenshot shows a snippet of the yellow separation.
Actually, setting “overprint” for all colors doesn’t make sense, it should be a setting for single color (but default for black):
% desired interface: \definecolor[overBlack][k=1,intent=overprint]
Hraban
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