Good point. I guess it’s possible if the OPPO is using some form of tone mapping and using the disc to determine these values then the only test patterns that would be viable would be those from that particular disc. Regular test patterns from a usb stick would not give the OPPO any meta data to use. I’d still like to not see clipping on static patterns however.
While I do agree with @Dave Vaughn that the new SDR modes are an improvement over the Strip Metadata method, and I also doubt those last four steps of "near-black" matter much with real-world content (at least by that scale, there are actually about 20 steps of "near-black" in that last 2% of the 10 bit greyscale), I also agree with @Clark Burk that there's room for improvement.
I tested using the same disk for HDR>>SDR conversion on my other UHD BRP (the first one in the US, the UBD-K8500; see results attached, brightness elevated to show what gets resolved again), and it resolves all steps (I had to connect it to a non-HDR display to confirm; on this non-HDR display, the 203 obviously show the same clipping behavior as my HDR-capable displays, regardless of HDR mode).
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