[NTG-context] Log message "Unknown filter 'DCTDecode'"

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