On Mon, 19 Jun 2017 12:21:00 +0200 luigi scarso <luigi.scarso@gmail.com> wrote:

With poppler 0.55,
I am able to reproduce it with

$ convert -size 100x100 radial-gradient: rgradient.jpg; convert
rgradient.jpg rgradient.pdf
$ cat test.tex

\starttext
\externalfigure[rgradient.pdf]
\stoptext

Syntax Error (623): Unknown filter 'DCTDecode'

I'm investigating

--
luigi

Thank you Luigi,

This error message is gone now. Sorry for the confusion I have created by not having reported a well defined way to produce this message.

Cheers, Christoph