Bug in overprint? (was: how to set overprint)

[Jano Kula <jano.kula@gmail.com>]

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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 <jano.kula@gmail.com> wrote:

>
>
> On Thu, 29 Oct 2020 at 23:12, Jano Kula <jano.kula@gmail.com> 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
>

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