[NTG-context] Background colour in PDF with export activated

[NTG-context] Background colour in PDF with export activated

[Florent Michel]

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Hi,

I'm having issues generating PDF files with a coloured background when
export is set to ‘yes’.

Minimal example:

\setupbackend[export=yes]
\setupbackgrounds [page] [background=color,backgroundcolor=black]
\starttext
\startcolor[white]
test
\stoptext

This example seems to work as expected when I comment out the first line (a
black page with the word ‘test’ in white). However, with the first line the
pdf looks entirely white. Is this a known issue, or am I doing something
wrong here?

Use-case: I am trying to generate a pdf and an html files with equivalent
content, the latter being primarily used for accessibility purposes. One
workaround is to split the tex file in two, e;g;:

% main.tex
\setupbackgrounds [page] [background=color,backgroundcolor=black]
\starttext
\startcolor[white]
test
\stoptext

%main-exp.tex
\setupbackend[export=yes]
\input{main.tex}

This way, I can generate the correct pdf by compiling main.tex and the html
by compiling main-exp.tex (adding a custom .css file to get a black
background).
But I'm wondering if there is a way of generating the correct pdf without
moving the line ‘\setupbackend[export=yes]’ into a different file.

Best regards,
Florent

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[NTG-context] Re: Background colour in PDF with export activated

[Henning Hraban Ramm]

Am 20.11.24 um 17:26 schrieb Florent Michel:
> But I'm wondering if there is a way of generating the correct pdf 
> without moving the line ‘\setupbackend[export=yes]’ into a different file.

Why don’t use use a mode?
\startmode[export]
\setupbackend[export=yes]
\stopmode

Then you can call "context --mode=export" etc.

(It’s a workaround, I don’t think activating the export should have this 
effect.)

Hraban
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[NTG-context] Re: Background colour in PDF with export activated

[Wolfgang Schuster]

Florent Michel schrieb am 20.11.2024 um 17:26:
> Hi,
>
> I'm having issues generating PDF files with a coloured background when 
> export is set to ‘yes’.
>
> Minimal example:
>
> \setupbackend[export=yes]
> \setupbackgrounds [page] [background=color,backgroundcolor=black]
> \starttext
> \startcolor[white]
> test
> \stoptext
>
> This example seems to work as expected when I comment out the first 
> line (a black page with the word ‘test’ in white). However, with the 
> first line the pdf looks entirely white. Is this a known issue, or am 
> I doing something wrong here?

When you use the export mode some features of Context are disabled and 
in your case the page background is one of these disabled features.

It has always been recommended to make separate runs for the PDF output 
and the document export.

Wolfgang

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[NTG-context] Re: Background colour in PDF with export activated

[Florent Michel]

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Le mer. 20 nov. 2024 à 17:09, Henning Hraban Ramm <texml@fiee.net> a écrit :

> Why don’t use use a mode?
> \startmode[export]
> \setupbackend[export=yes]
> \stopmode
>
> Then you can call "context --mode=export" etc.
>

Thanks a lot for that, Henning! It indeed works perfectly!

Le mer. 20 nov. 2024 à 17:15, Wolfgang Schuster <
wolfgang.schuster.lists@gmail.com> a écrit :

> When you use the export mode some features of Context are disabled and
> in your case the page background is one of these disabled features.
>
> It has always been recommended to make separate runs for the PDF output
> and the document export.
>

Thank you Wolfgang for the explanation! That makes sense - and with the
workaround suggested by Henning making separate runs is no problem.

Best regards,
Florent

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