Re: [NTG-context] Transparency in PNGs becomes black in PDF/X

20 Dec 2019

      But that’s no reason to paint it black!
I don’t think an alpha channel of a picture would need real PDF transparency.
InDesign & Co will flatten transparencies and create or combine pictures as necessary.
I can’t expect ConTeXt to do that. But I see no reason to convert the alpha channel that way.

Ok, time to update my setups.

Hraban
...
Am 2019-12-20 um 11:00 schrieb Peter Rolf :
Hi Hraban,
PDF/X-1a:2001 doesn't support transparency. You have to use PDF/X-4(p)
for that (the first X variant that supports transparency).
PDF/A-2|3 may also be an option. These formats also support transparency.
Peter
Am 19.12.2019 um 21:49 schrieb Henning Hraban Ramm:
...
I think this is the same problem that I had in Bassenge:
The transparent part of PNGs like the attached one becomes black if I
try to make an PDF/X.
I hope that is solvable...
\setupbackend[format=PDF/X-1a:2001]
\starttext
\externalfigure[kinder/esel_kl]
\stoptext
Best, Hraban
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