Re: [DCP-o-matic] weird colors

I jumped on Manuels description because I remember very well the moment I saw this similiar issue on our screen - it was the first full feature that I converted to be shown on our then brand new Sony. I used DVD-o-matic, I chose REC709 as it was grabbed from a BluRay. I then noticed the result was to bright and flat on the projector, and it had greenish/blocky artifacts in some dark parts. I couldn't redo it in time, so I made a new preset on the projector, reducing brightness considerably and increasing contrast slightly. That made it watchable. I still have that machine with DVD-o-matic on it, so I recently did it again with the same setting, and it turned up again. Today I installed a recent version of DCP-o-matic on the same machine and did the same scene with it, using same source file, scaler, REC709 preset, datarate setting, etc Now, the issue is gone. The images attached are screengrabs from VLC playing/pausing the resulting MXF (one done with DCP-o-matic, the other with DVD-o-matic) - so they are not gamma and inverse xyz corrected - but the issue still can clearly be seen in the lower left part, in the shadow below her right shoulder. The version from DVD-o-matic has strong blocking and a greenish tint there (also on our projector with proper xyz rendering), a very flat gamma in general, while the version from DCP-o-matic has full cloth detail and 'real' shadows with texture. It shows a lot stronger on my Windows machine than on my Mac due to their different display gamma. So, this might now just be a historical issue related to DVD-o-matic. It had no user editable color conversion matrix then. Maybe something was wrong there. Yet the visible blocking would be caused by the J2K compression I guess. Both images were processed with 200MBit/s, and other parts of that feature had no blocking issues. - Carsten