Ah I see. So "HDMI Black Level" actually refers to the RGB range?
If so, how is the mapping? HDMI Black Level "Low" is RGB 16-135 Limited Range I presume?
BTW, the TV does allow switching HDMI Black Levels even when in PC mode and I can clearly tell the difference between normal/crushed colors when flipping back and forth.
Switching between PC and other modes only switches the chroma.
I should have tested further with the DL-5500 adapter. Oh well, the DL-6950 gives me 4K@60Hz so its all good.
Learnt something new. Thanks very much.
P.S. 40-43" 4K TVs look pretty sweeet as monitors
For people stumbling on to this thread later, to use the Samsung MU6300 4K TV as a monitor:
1. HDMI UHD Color: On
2. HDMI Black Level: Normal, NOT Low. Otherwise, you have color crush
3. Mode : Set to "PC" otherwise, you don't get 4:4:4 chroma
The TV only correctly sets PC mode if the refresh rate is 30/60 Hz. If its lower eg. 24Hz it does not successfully set PC mode even if set manually. At 24Hz you still get only 4:2:2 chroma.
Backlight 15, Brightness 0, Contrast 100, Sharpness 30, Color Tone "Warm2" -> these are just my preferences.
Links of relevance:
https://www.rtings.com/tv/reviews/samsung/mu6300
https://medium.com/@keredson/using-t...r-8582390bb824