The other day, we thought we’d hit upon a solution for the grayed out HDMI black level settings on our Samsung S90C QD-OLED, but it still behaves unpredictably when receiving a signal over HDMI and it isn’t always possible to do anything about it. Sometimes HDMI Troubleshooting works, sometimes it doesn’t. For now, if we can’t put the TV into Full range, we just color correct in Video range. We might use Video range from here on out anyhow, as there is no advantage to using Full range. DaVinci Resolve and Dolby Vision certified trainers have always insisted on Full data levels for HDR video monitoring and delivery, but in fact, either Full or Legal range may be used. The original Dolby Vision workflow recommendation of full range was solely because their eCMU could only handle SDI signals in the full range format. Whichever you choose, when exporting, be sure to leave data levels set to Auto. From Dolby Professional:
- Video monitoring via iCMU can happen in Full or Legal range
- Ensure that the input of your reference display matches to the video output of the color corrector (Full-Full or Legal-Legal)
- Using the eCMU requires a Full range video output from the color corrector
- Use the default data level setting (auto) when exporting your video
- There’s no need to change the Dolby Vision metadata for ProRes exports
The Daejeon Chronicles 
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