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From: Duncan Hothersall via ntg-context <ntg-context@ntg.nl>
Newsgroups: gmane.comp.tex.context
Subject: Re: overprinting black
Date: Wed, 9 Nov 2022 16:22:23 +0000
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Have you tried overprint=3Dyes? 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=E2=80=99m not sure if this ever worked, but at least in latest LMTX it =
doesn=E2=80=99t:
>
> """
> \setupcolors[state=3Dstart,cmyk=3Dyes,rgb=3Dno,intent=3Doverprint]
>
> \starttext
>
> \framed[
>    background=3Dcolor,
>    backgroundcolor=3Dyellow,
> ]{\ss\bfd
>    Black should always overprint.
> }
>
> \stoptext
> """
>
> The black text and frame border don=E2=80=99t overprint the yellow backgr=
ound
> but knockout. The only way to check this (that I know of) is Acrobat
> Pro=E2=80=99s separation simulation; the screenshot shows a snippet of th=
e
> yellow separation.
>
> Actually, setting =E2=80=9Coverprint=E2=80=9D for all colors doesn=E2=80=
=99t make sense, it
> should be a setting for single color (but default for black):
>
> % desired interface:
> \definecolor[overBlack][k=3D1,intent=3Doverprint]
>
> Hraban
>
> _________________________________________________________________________=
__________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> https://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : https://contextgarden.net
>
> _________________________________________________________________________=
__________
>

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<div dir=3D"ltr">Have you tried overprint=3Dyes? I have that in old files w=
hich used to work under mkii. I must admit I haven&#39;t had the need to us=
e overprinting since then, but I do recall that come colour handling wasn&#=
39;t ported across to mkiv or later.<div><br></div><div>Duncan</div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed,=
 9 Nov 2022 at 16:12, Henning Hraban Ramm via ntg-context &lt;<a href=3D"ma=
ilto:ntg-context@ntg.nl">ntg-context@ntg.nl</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">I=E2=80=99m not sure if this eve=
r worked, but at least in latest LMTX it doesn=E2=80=99t:<br>
<br>
&quot;&quot;&quot;<br>
\setupcolors[state=3Dstart,cmyk=3Dyes,rgb=3Dno,intent=3Doverprint]<br>
<br>
\starttext<br>
<br>
\framed[<br>
=C2=A0 =C2=A0background=3Dcolor,<br>
=C2=A0 =C2=A0backgroundcolor=3Dyellow,<br>
]{\ss\bfd<br>
=C2=A0 =C2=A0Black should always overprint.<br>
}<br>
<br>
\stoptext<br>
&quot;&quot;&quot;<br>
<br>
The black text and frame border don=E2=80=99t overprint the yellow backgrou=
nd <br>
but knockout. The only way to check this (that I know of) is Acrobat <br>
Pro=E2=80=99s separation simulation; the screenshot shows a snippet of the =
<br>
yellow separation.<br>
<br>
Actually, setting =E2=80=9Coverprint=E2=80=9D for all colors doesn=E2=80=99=
t make sense, it <br>
should be a setting for single color (but default for black):<br>
<br>
% desired interface:<br>
\definecolor[overBlack][k=3D1,intent=3Doverprint]<br>
<br>
Hraban<br>
___________________________________________________________________________=
________<br>
If your question is of interest to others as well, please add an entry to t=
he Wiki!<br>
<br>
maillist : <a href=3D"mailto:ntg-context@ntg.nl" target=3D"_blank">ntg-cont=
ext@ntg.nl</a> / <a href=3D"https://www.ntg.nl/mailman/listinfo/ntg-context=
" rel=3D"noreferrer" target=3D"_blank">https://www.ntg.nl/mailman/listinfo/=
ntg-context</a><br>
webpage=C2=A0 : <a href=3D"https://www.pragma-ade.nl" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.pragma-ade.nl</a> / <a href=3D"http://context.a=
anhet.net" rel=3D"noreferrer" target=3D"_blank">http://context.aanhet.net</=
a><br>
archive=C2=A0 : <a href=3D"https://bitbucket.org/phg/context-mirror/commits=
/" rel=3D"noreferrer" target=3D"_blank">https://bitbucket.org/phg/context-m=
irror/commits/</a><br>
wiki=C2=A0 =C2=A0 =C2=A0: <a href=3D"https://contextgarden.net" rel=3D"nore=
ferrer" target=3D"_blank">https://contextgarden.net</a><br>
___________________________________________________________________________=
________<br>
</blockquote></div>

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