Hi,

In recent versions of ConTeXt/luatex, I observe the following log entry:

Syntax Error (77727): Unknown filter 'DCTDecode'

This happens if the document includes JPEG images, e.g:

\starttext
\externalfigure[hacker.jpg]
\stoptext

The output PDF looks, however, fine. Does this message have any
significance?

Cheers,
Christoph