[NTG-context] Bug in overprint? (was: how to set overprint)

9 Nov 2020

      Hello,

may I ask someone, who understands knockout and overprint in the printing
press, to check test cases in the attached file from the test suite, if
overprint is working or not in Mark IV, please?

Regards,
Jano

On Fri, 30 Oct 2020 at 11:02, Jano Kula  wrote:
...
On Thu, 29 Oct 2020 at 23:12, Jano Kula  wrote:
...
Hello,
whatever I try, I cannot get the overprinting right (checked in Output
Preview of Acrobat). Even overprint-001.tex from the test suite
(2020-09-19) doesn't seem to have it right (latest beta). What I'm missing
here?
\setupcolors[intent=overprint]
\startTEXpage[offset=10mm]
\framed[frame=on,offset=10mm,
        background=color,backgroundcolor=darkgreen]{
%         \startcolorintent[overprint]
        \startoverprint
        text in black
        \stopoverprint
%         \stopcolorintent
        }
\stopTEXpage
Thank you,
Jano
Forgot to say, I've also tried to add
\setupcolors[state=start,rgb=no,cmyk=yes]
though I think, at least state=start isn't needed anymore.
It doesn't change the overprint issue.
Jano