Originally Posted by Onkyoman
Black Hawk Down was completely remastered for the 4K UHD version. In your 220 nits shot, there is still a roll-off of the image if you only getting ~40 nits at the screen, but the image doesn't look too bad. It is a darker movie, in general.
The no compression limit basically disables tone mapping of any scenes within this limit. The range is up to preference. But the current dynamic target nits formula also uses the no compression limit as the baseline offset to calculate every display target nits used if the no compression limit is higher than the real display peak nits entered in madVR. So it has a large impact on the brightness of the image.
Display Target Nits
Max(no compression limit, min target / real display peak nits) + [2x scene Fall × (dynamic tuning % / 100)]
Projected peak nits can be difficult to estimate. If you have a light meter, you can follow SirMaster's advice on how to calculate it:
If you think you are getting 35 nits, I would enter 35 nits. You might want to lower the dynamic tuning value if you are getting less than 50 nits of peak brightness. A peak of 35 nits is not HDR by any means, so there will be a lot of tone mapping happening to fit a 1,000 nits source to your screen brightness.
I don't think your images in the next post look that bad. You can't really use the SDR version of a movie as a comparison of brightness given the low peak brightness of your screen.
Did some more tests.
Seems the screen is around 50 nits brightness, estimated. 65 with BC on, but I keep it off.
What do you mean by roll-off of the image?
Why is the Maximal target nits 480? If it's increased the image becomes darker, but why 480?
For Soulnight's measurement tool with titles that have had their black bars removed, it says not to use dynamic clipping. What if a video's format is 16:9? Or what format would not be considered to have black bars?
That's why most people keep "dynamic clipping" deactivated in the LIVE algo but keep it activated at 100% with the optimizer tool to get an extra "punch in the picture".
Should dynamic clipping be checked when playing a file with measurements in madvr>hdr>dynamic clipping? Or is the option just enabled from the optimizer?
Enter the Minimal target nits / real display peak nits (50-150 recommended for most).
I'm using a secondary LCD monitor which originally had 300 nits, can I keep it at 200-250 peak display peak nits?
The biggest issue is that for some scenes, or some movies, the dark parts are grey and not black. It's like a grey veil over the image. Even lowering brightness from the PJ from 51 to 50 or 49 does not fix it.
Picture 1 (BHD) is an example. 50 peak nits, 100 dynamic tuning. The rest are from the example you posted.
Tried increasing the peak nits, lowering the dynamic tuning to 50, which made it more grey. With 50 peak nits and 50 dynamic tuning, lowering the brightness to 50/49 gave the best result, but still poor.
Picture 2 and 3, The Redwoods and Sony Swordsmith behave the same as Picture 1. The black floor is elevated. Increasing Dynamic tuning to 150-200 made the image darker, but the grey veil remained. No compression limit did not help either.
Besides the grey veil issue, there seems to be a discoloration of the material.
Pictures 4 and 5 are with the same settings above. Picture 5 is with measurements (Fall algo, settings in last picture). Between the 2 the Live algo seems to be more bright and colorful.
The 6th picture is from the SDR version, which is much brighter and colorful. I know these are two different formats, but the SDR version is objectively better than the HDR.
Haven't done too much viewing, but it seems the discoloration happens in other files, it's just that in the brighter more colorful ones it's less obvious, and I don't have SDR versions for all of them.
I find it difficult to believe that this is the creator's intent, so either the settings are not right or at least with the grey-ish images my displays cannot hand deep blacks. The last part is true, but playing around with the settings can give better blacks than with some of the scenes mentioned above.
What other settings should I try?