overprinting black

overprinting black

[Henning Hraban Ramm via ntg-context]

[-- Attachment #1: Type: text/plain, Size: 720 bytes --]

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

[-- Attachment #2: Bildschirmfoto 2022-11-09 um 17.05.47.png --]
[-- Type: image/png, Size: 22375 bytes --]

[-- Attachment #3: Type: text/plain, Size: 496 bytes --]

___________________________________________________________________________________
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
___________________________________________________________________________________

Re: overprinting black

[Duncan Hothersall via ntg-context]

[-- Attachment #1.1: Type: text/plain, Size: 1678 bytes --]

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
>
> ___________________________________________________________________________________
> 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
>
> ___________________________________________________________________________________
>

[-- Attachment #1.2: Type: text/html, Size: 2557 bytes --]

[-- Attachment #2: Type: text/plain, Size: 496 bytes --]

___________________________________________________________________________________
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
___________________________________________________________________________________

Re: overprinting black

[Henning Hraban Ramm via ntg-context]

Am 09.11.22 um 17:22 schrieb Duncan Hothersall:
> 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.

Thank you for the hint, but it doesn’t work, neither in \setupcolors nor 
in \definecolor.

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
___________________________________________________________________________________