Originally Posted by bathes2051
I’ve looked at the S&M evaluation patterns in HDR10 mode and am now in the Brightness 0 camp. At -1, the level 68 checkerboards disappear.
This is not how you set brightness.
You set brightness by using the highest setting that doesn’t raise the black floor (hence kills your on/off contrast). Often, this means crushing 17 or 68, in order to keep 16/64 black.
This is especially the case when peak white is low.
I frequently have to crush 17 in sdr when peak is 50nits or less, while it’s easier to just resolve 68 in hdr with a 100nits peak.
With 3.10, I still have to use a -2 setting for brightness, otherwise it raises the black floor and kills on/off. This is obvious visually and confirmed by measurements. My on/off goes from 30,000:1 with brightness=-2 to 24,000:1 with brightness=0 (this is low lamp, iris fully open, with filter, mid throw).
If you don’t have a meter able to read black, put a black pattern on screen and press hide on the remote. There should be no difference.
You don’t set brightness by resolving 17/68. You set brightness by NOT raising 16/64.