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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