PG32UCDM Console Mode HDR issue

[FallenDeity]

My and other's PG32UCDM monitors have a clipping issue on PC when using the console HDR mode in Windows 11. Currently, the monitor clips at 450 nits in the Maximum Luminance window but it clips correctly in the Max Full Frame Luminance window. Is there a firmware update in the works for this or is this an RMA issue?

[BiscuitJar]

Very interesting, looks like Gaming HDR and Cinema HDR have the boost always active and its not even toggleable off anymore?

And indeed as @Kundica has posted measurements of Cinema HDR before, it has strongest rolloff for higher end brightness values out of the three HDR10 modes so it best mitigates clipping!

Not sure if boost always being on is a bug but this looks really good. Brightness is similar to Console HDR but much less clipping because of the rolloff instead of hard clip.

[KobeMcgrady]

I see no difference at all from anything 

[GabiP]

Me neither man! Tbh I feel like a simpleton in that story "The new clothes of the emperor"

[Kass_UA]

Guys, please explain, by clipping, do you all mean the image began losing details? Like, become overbrighten?

[finalmaxgear]

But with "Cinema HDR" and "Dynamic Brightness Increase," is it still necessary to use Windows HDR calibration to achieve optimal brightness?

[InvictuSZN]

If the game you're playing is depending on it, I'd say yeah

If the game has ingame settings for everything then I dont think so.

[InvictuSZN]

I gotta say, Ive been playing Elden Ring with HDR for the past few hours with Cinema HDR and I'm really impressed and happy with the results so far.

[finalmaxgear]

I set "Cinema HDR" with "Dynamic Brightness Increase" ON, and started "Windows HDR Calibration," I got up to 1200nits, compared to 1060nits before(Console HDR and Dynamic Brightness Increase turned off).

[Kundica]

It's not actually giving you 1200 nits, it's just tonemapping up to 1200. The panel is only capable of around 1050 nits and only at 2-3% APL or less.

[BiscuitJar]

You should ignore the "visual" part of calibration. That only works for "pure" ETOF curve monitors. OLED tricks like ABL (every panel has different APL window sizes) and curve rolloffs can make the calibration visual part completely unreliable.

Only thing important about calibration app is to let Windows know the peak brightness and fullscreen brightness capabilities of your display. For PG32UCDM Console HDR & Cinema HDR modes you should just set:

• Maximum Luminance: 1000 nits (or less if you want to reduce clipping further)
• Maximum Full Frame Luminance: 260 nits

Because those are what your display panel can actually do. Setting higher values will just mess up your HDR image.