Originally Posted by Tom Roper
What static metadata do you override and what do you replace it with?
Max Luminance and MaxCLL 600.
Min Luminance and MaxFALL 0 (these don't seem to matter).
My goal is to disable tone-mapping.
I have not measured the curves so it is hard to say which settings track the EOTF best, so it is to taste.
Vincent Teoh's Batman V Superman comparison shows just how dark a title with 4000 nit metadata becomes.
The C7 dynamic tone-mapping does not correct this scene because there are spectral highlights.
In the image attached, the Sony (left) has little or no tone-mapping, C7 (center) has aggressive tone-mapping with reduced APL, and Panasonic (Right) is less aggressive mapping.
There seems to have been a singular focus on preserving detail in spectral highlights but APL is drastically reduced and low level detail is lost.
This may have lent many a reviewer astray, perceiving the title itself as dimmer than the SDR version when it may actually be coming from the display.
I re-watched BvS with the tone-mapping override and in this title it is much improved.
Daylight scenes no longer look like twilight.
Bright flashes loose detail but they have a greater impact because more of the screen is bright, which I feel it truer to the intent.
I have also attached Vincent's measurement of the tone-mapping for 4000 nits. which shows that dimming occurs below 100 nits.
LG seems to be continuing to have separate tone-mapping curves for 1000, 4000, and 10000 nits in the 2019 OLEDs.
If like the C7, these influence dynamic tone-mapping, then that is a mistake. Thankfully, Calman can be used to alter these curves.
I don't see why a display with dynamic tone-mapping should display a scene with max luminance of 500 nits differently based on the static metadata.
It seems contrary to the purpose of moving to the PQ EOTF, namely, reproducing the mastered image faithfully at home.
Dynamic tone-mapping should ignore the static metadata, but at least on the C7, it does not.