On Mon, 19 Jun 2017 12:21:00 +0200 luigi scarso

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