I'm now convinced that this bug is related to libjpeg-turbo: It seems like the faulty image viewers don't do the CMYK-RGB conversion themselves, they receive RGB data from libjpeg.
See this report for eog: https://bugzilla.gnome.org/show_bug.cgi?id=737440 Libjpeg seems to be doing an "optimistic" CMYK - RGB conversion without any color management. This leads to wrong colors in the output. Instead, libjpeg should either - report an error "CMYK images not supported" or - pass on the CMYK data or - do a color managed RGB transformation. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org