Originally Posted by DVD MAN
When switching color space from 422 to 444 on the NX9 I see this. Does not happen on my RS500🤔
The new JVCs don't support RGB or YCC 444 in 12bits (this is in fact stated in the manual, even if there is no reason for this limitation, at least from a bandwidth point of view). They force an internal conversion to YCC 422 whenever 12bits is used, even when the frame rate is 30p or below (so when the 18Gb/s bandwidth limit isn't reached), yet they display RGB or YCC 444 in the info panel. JVC knows about this, so hopefully a fix is on the way, provided this isn't a non-bandwidth related hardware limitation.
So if you select the colorspace manually when sending 12bits from the source and are not using AUTO in the JVC, you get the wrong colorspace unless you manually select YCC 422.
If you select AUTO, the colorspace is still forced to YCC 422 internally when the JVC receives 12bits 444, but YCC 422 is AUTOmatically selected so the picture doesn't look obviously wrong (though chroma might suffer from the double conversion).
Bottom line is, until/unless this is fixed/improved, you should only use RGB 8bits or (YCC 422 if you really want 12bits), otherwise you can get the wrong colorspace (if not using AUTO) or chroma upsampling issues (the JVC does a chroma conversion behind the source's back when forcing YCC 422 internally).
With madVR, I recommend RGB 8bits Full. This means that madVR upscales from 420 to 444. There is no banding if the other settings (especially bit depth and dithering) are correct.
With a UHD Player or other consumer sources, I recommend YCC 422 10 or 12bits. This means that the source upscales from 420 to 422, and the PJ upscales from 422 to 444, which is fine. There is no colorspace and/or chroma conversion happening behind the source's back.
These are the only two modes that do not suffer from the forced YCC 422 conversion in 12bits and the potentially related issues.
Again, it is recommend to switch low latency ON (CMD forced to disable) and motion enhance OFF in all modes, whether video or gaming. You can use these processing "features" if you don't get artifacts and if you like the results, but if you get issues reverting to Low Latency ON and Motion Enhance OFF should always be the first step.