WOW!
Now I have a picture that looks almost like the original source from my HD-DVR.
I turned off most of the processing (noise reduction, edge, etc.). But the most important was to set Limited RGB (16 to 235) instead of Full RGB (0-255). Now the blacks are black and the whites are white.
The last thing: I’m not able to set the resolution to native 1360×768 60Hz. I’m now configured at 1280×720 60HZ with some overscan. CCC offers 1360×768 30 Hz, but not 60 Hz…
It was available via DVI, but not with HDMI…