Originally Posted by Dominic Chan
I have done some measurements of the JVC ST2084 Curve on my RS520, and compared the response to the standard PQ curve. The values are normalized relative to the 50% stimulus (reference white).
Here are some observations:
1. The shadows are very dark - only about 40% of the reference value. at 10% stimulus.
2. Boosting the WRGB Dark Levels to +7 greatly exceeds the reference shadow level.
3. The Contrast control lifts the entire curve up, resulting in clipping at a lower level (although still above 1000 nits, at +7 contrast)
Thanks for this info.
Dominic... what is your source setup? Which player? I'm not sure if it matters, but I'm curious is you might be able to see and measure inherent differences between the 203 and one of the Sony players?
Can you find a combination of WRGB DL which works better? +7 on WRGB would be pretty dramatic. How about +4/+5 all around?
I'm also curious how a well tuned curve while increasing Contrast, could work to better iron issues on both ends? I thought Zombie did this, but he was not specific.
Or what keeping Contrast closer to = 0 and playing with st2084 Picture Tone & BL values instead?
Can you determine what, if any range luminance compression LLDV might be doing, such that any peak white values mastered above MaxCLL of 1000 nits, are being mapped down?
I need to revisit some of Javs work on his HDR mapping, for the movie time stamps, to look for highlight clipping.