Originally Posted by jeahrens
I spent just over an hour with the projector total. The Panasonic presets on the JVC do not allow access to the projector tone controls. I did a quick and dirty comparison with the default HDR mode and the Panasonic mode and raising contrast more or less equaled the default HDR/BT2020 profile when using the JVC Panasonic profile. The HDR optimizer on the Panasonic 820 may be a better route here but I simply had no time to go back and forth. There was no visible clipping in Lebowski or 2049 in the brief time I spent. Lighting did not look blown out in either title. I'm sure as I get more familiar with the projector and how it interacts with the 820 most of these settings won't be what I end up with.
The Panasonic is setup for basic Luminance/Projector, HDR/BT.2020, 4:2:2 color, HDR optimizer on.
I don't know about Lebowski but there are close to zero highlights in BR 2049 (it almost never goes above 100nits), so not the right title to check for this. Take a title with a lot of highlights, such as The Meg, Starship Troopers, Mad Max Fury Road, Batman vs Superman, any of the last two Harry Potter films, Ghosbusters 2016 or even The Shallows or Pan.
I'm sure that someone who uses the 820 will comment further on best practices with these modes, but I really doubt that raising brightness [edit: typo, meant contrast, obviously] to +11 does any good to your picture. There must be some settings in the panasonic to adjust this, otherwise it's simply not doing what it should be.
When using the JVC tonemapping, I have to move the slider to +3 or +4 to get decent results on my small 88" diag screen. When using madVR, it's never too dark and I have contrast at zero.
So I would look into an alternative way, possibly in the 820, to make the picture brighter (once you have fully opened the iris of course, and possibly after having switched to high lamp if necessary depending on screen size/gain, as these should be the first steps to get close to the target the 820 tonemapping is expecting).