Quote:
Originally Posted by Warner306
Something is lost in translation when going from HDR -> SDR.
If the target nits is higher than the display's actual brightness, you are only getting a ratio of the original curve.
Example: 480 target nits shown at 200 actual nits
480 nits is the lowest value of BT.2390 where the soft knee (where compression begins) is above reference white (100 nits). Lower values will place the soft knee lower and lower and compress at least some of the first 100 nits. The lower the target nits, the more reference white is compressed...
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Yes, you are right, I mixed up the comp monitor's results with my 500 nits SDR TV that indeed follows the original PQ curve up to 50% (but the roll-off is still very abrupt and is still clipped in 80-100% range, only when I select Master MaxL in HCFR to 10000 nits does the BT.2390 reference that HCFR underlays follow the MadVR roll-off more closely -still trying to get my head around this...this could well be a HCFR settings problem...
MadVR puts the diffuse white at about 80 cd/m2 for the said 200 nit monitor. Does this sound as being more in the ballpark?