Nits. What are these values and which software is used to view them?

[maldon]

Hi. Caps-a-holic shows on the vast majority of Ultra HD Blu-ray: 100 nits. But in some cases it shows 80 nits and 150 nits (I have marked it in red).





What is that nits value?
Is it MaxFALL or what?
What software can I use to see this value on each Ultra HD Blu-ray?

I have also found these graphs:



With which software can I view these graphs? I want to get the MaxCLL values in some Ultra HD Blu-ray.

[benwaggoner]

Are those titles HDR, or just SDR UHD?

The values would be really low for remastered MaxCLL, so possibly MaxFALL? Both numbers really aren't useful in practice.

[benwaggoner]

Originally Posted by benwaggoner

Are those titles HDR, or just SDR UHD?

The values would be really low for remastered MaxCLL, so possibly MaxFALL? Both numbers really aren't useful in practice.

Nah, they are way too low for MaxFALL as well. Maybe some sort of mean MaxFALL measurement or something?

[maldon]

Originally Posted by benwaggoner

Are those titles HDR, or just SDR UHD?

The values would be really low for remastered MaxCLL, so possibly MaxFALL? Both numbers really aren't useful in practice.

Originally Posted by benwaggoner

Nah, they are way too low for MaxFALL as well. Maybe some sort of mean MaxFALL measurement or something?

Hi, Ben. They are all HDR UHD:

https://caps-a-holic.com/c.php?d1=18734&d2=16762&c=6174

https://caps-a-holic.com/c.php?d1=14598&d2=14596&c=5611

Normally attention is paid only to the brightness; 1000 nits, 4000 nits, or 10,000 nits. That is why I do not understand what this low value is.

The other thing is...

Why does the BDinfo sometimes show the nits (brightness) and sometimes not?

For example, The Birds:

https://caps-a-holic.com/c.php?d1=14598&d2=14596&c=5611

MPEG-H HEVC Video 62428 kbps 2160p / 23.976 fps / 16:9 / Main 10 @ Level 5.1 @ High / 4:2:0 / 10 bits / 1000nits / HDR10 / BT.2020

And Casablanca:

https://caps-a-holic.com/c.php?d1=17736&d2=17732&c=6534

MPEG-H HEVC Video 93612 kbps 2160p / 23.976 fps / 16:9 / Main 10 @ Level 5.1 @ High / 10 bits / HDR10 / BT.2020

That's why I would like to know which software generates these graphs to see the nits (the one in the image above).

[Kuler087]

They are madVR ''display peak luminance target nits'' values for the HDR to SDR tone mapping.

[huhn]

no they are not.
that value should be your peak nits and nothing else the movie has nothing to do with it.

but madVR can show you the nits of the current frame if you take the highest you find then you have the peak HDR of that file.
there are better ways to do that but i don't know them.

[rwill]

I don't know if Caps-a-Holic is using madVR for its preview pictures but the nits in question next to the HDR BluRays icons seem to show the nits value the HDR got mapped to. That is HDR to SDR@nits to display it on a web page in more or less correct colors and brightness. So Kuler087 is right.

Now the graphs in question show Dolby Vision Level 1 metadata over a sequence. These are only loosely related to a scene or picture nits value as can be seen in the example graph, which is somewhat constant over large parts of the movie. They are used for the dynamic Dolby Vision Mapping.

[Kuler087]

Originally Posted by huhn

no they are not.
that value should be your peak nits and nothing else the movie has nothing to do with it.

but madVR can show you the nits of the current frame if you take the highest you find then you have the peak HDR of that file.
there are better ways to do that but i don't know them.

Yes they are what the OP is asking. I know what they are and how they are supposed to be used.

PS I'm perfectly aware of how madvr works, Im using it to create these HDR plot graph:

[huhn]

Originally Posted by rwill

I don't know if Caps-a-Holic is using madVR for its preview pictures but the nits in question next to the HDR BluRays icons seem to show the nits value the HDR got mapped to. That is HDR to SDR@nits to display it on a web page in more or less correct colors and brightness. So Kuler087 is right.

not how tone mapping works.
the "display peak luminance target nits" has absolutely nothing todo with the nits a movie is mastered at.
the only number "display peak luminance target nits" should be is the display nits not the movie.

they have done that but that doesn't change that the results are objectively wrong.

to compare a movie you have to use the same nits or the result is just wrong.

[Kuler087]

Yes we know how madvr tone mapping works and but some people like Caps-a-Holic guys lie to their display and change the target nits just to match the SDR bluray brightness better which is the OP initial question.
We are NOT saying that this is the correct way to tone map HDR to SDR

[huhn]

fair enough.
the page is just a waste of time.
https://caps-a-holic.com/c.php?a=1&x...4&l=0&i=0&go=1

yes the 80 nits one is going to be brighter then the 100 one when i watch that on my calibrated 120 nits display.

[tormento]

Originally Posted by Kuler087

PS I'm perfectly aware of how madvr works, Im using it to create these HDR plot graph

Can you explain the procedure?

[Kuler087]

Originally Posted by tormento

Can you explain the procedure?

There's a link to my scripts in my signature. Workflow 6-2 to plot HDR with madvr