[NTG-context] background color, was: CMYK Color profile

Benjamin Koppe Benjamin.Koppe at gmx.de
Fri May 31 21:23:08 CEST 2019


Hi Jan,

yes, I've read these texts once and they played a role in thinking about getting into ConTEXt.

Thank you for your answer, now I have something to investigate.

Another follow up question on background colors:

I try to setup the background color by

 \setupbackgrounds[page][backgroundcolor=blue]

This works for the actual flyer, but the bleed remains white.

I also tried replacing 'page' with 'paper', but then the whole document has white background...

I saw your Hostsharing flyers do also have colors/graphics reaching the edge of the flyer, so I figure you ran into the same problem once.

Thanks a lot
De Benny

Am 31. Mai 2019 07:56:02 MESZ schrieb "Jan U. Hasecke" <juh+ntg-context at mailbox.org>:
>Am 30.05.19 um 23:34 schrieb Benjamin Koppe:
>> Hello everyone,
>> 
>> I'm about creating a DIN Lang Folder brochure with ConTEXt. I got
>> everything set up the way I'd like it to. Now that I'm done with the
>> work, I've been told the output pdf should have a CMYK Color profile
>> embedded for the on demand printing service to be able to deal with
>the
>> file...
>> 
>> I am unsure what steps I have to take to make my output pdf compliant
>> with CMYK. I don't even know how I could verify it does indeed have
>> CMYK. Evince doesn't seem to show that info...
>> 
>> So if anybdy of you could give me some hints, that's be wonderful.
>> 
>> Cheers
>> De Benny
>
>Hi Benny,
>
>if you can read German you might find some hints in my articles about
>creating din lang folders
>https://www.hasecke.eu/post/werbemittel-mit-context-gestalten/
>
>On colors read the second part:
>https://www.hasecke.eu/post/wie-wir-bei-hostsharing-mit-context-arbeiten/
>
>Search the mailing list for color profile questions because I had to
>ask
>often to make my things work. ;-)
>
>The wiki contains some hints, too.
>
>
>What you can do is to create a mode like this:
>
>\startmode[fogra39]
>
>\doiffileelse{CoatedFOGRA39.icc}{}{\farbprofilnichtgefunden}
>% This will be printed in log if context does not find the profile for
>% some reason
>
>\definecolor  [hs-logoblau]   [c=1.000, m=0.735, y=0.279, k=0.160]
>
>\definecolor  [hs-dunkelblau] [c=0.844, m=0.544, y=0.070, k=0.000]
>
>\definecolor  [hs-hellblau]   [c=0.468, m=0.220, y=0.086, k=0.002]
>
>\definecolor  [hs-orange]     [c=0.127, m=0.832, y=1.000, k=0.042]
>
>\setupcolors[cmyk=yes,rgb=no,]
>
>\setupbackend[
>   format=PDF/X-3:2003,
>   intent={Coated FOGRA39 (ISO 12647-2:2004)},
>   ]
>
>\stopmode
>
>If you call context with --mode=fogra39 you will get these color
>definitions and the defined pdf format with the right profile (intent).
>
>If you download additional icc profiles (eg. the fogra one is missing
>in
>the context distribution) put them here:
>context/tex/texmf-local/colors/icc
>
>In this folder they won't be overwritten by an update.
>
>There are some limitations in ConTeXt concerning colors as embedded
>images are not converted, so RGB images are converted only by the print
>shop during printing, which can lead to strange results. I think the
>only way to control the output is to convert all images to CMYK by
>hand.
>By doing this you can modify them to get the best results.
>
>I hope that helps
>juh
>
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