DirectX11 messes with HDR

[oepoemoepoe]

When using the DirectX11 mode, it somehow discards HDR. I have non-HDR coloring (e.g. red turns to orange and everything is brighter). This does not occur in DirectX9 mode or when ScreenCap is turned off.
I am using MPC-BE with madVR to play a 4K HDR movie.

What might be the reason? I am happy to try out any suggestions.
Thanks!

[sabaatworld]

Even with HDR, I remember noticing that it would record screen in 8-bit color instead of 10-bit. Maybe there's an API for DirectX that supports 10-bit.

[oepoemoepoe]

Are you talking about DirectX9 oder 11 mode? Wouldn't that mean that the colors sent to Hyperion are terribly wrong? They did not seem noticeably wrong to me...

[sabaatworld]

I believe in both modes, the colors are being sent as 8-bit. The API used to capture the screen in either mode return 8-bit image, even if the screen is running in HDR mode.

If now they have added some APIs to capture HDR and Hyperion supports 10-bit colors, we can try to find some way to send it over, but I'm not sure about either of those.

[pho084]

Hi

i too have noticed all kind of weird behaviour with HDR and Hyp.Screen Cap. It seems that while HSC is running as soon as an application tries to go exclusive-full-screen said application's "handling" of the HDR metadata is overwritten and windows desktop settings kick in.

to reproduce this:
when windows HDR is enabled and i run an application with HDR support (e.g. a game) and then enable ScreenCap from within the game, the screen will "add" windows HDR "on top" of the game settings resulting in a overly bright / saturated image or washed out colors.

This only occurs in fullscreen mode though (bc. windowed/borderless uses desktop settings anyway).

So it would be great if HSC supported HDR-full screen.

(the only app that i found which kind of circumvents this issue for video-playback is the experimental kodi-19-matrix with hdr support if you enable "refresh rate / resolution change on playback" and have HSC running beforehand. I haven't found a workaround for games demanding full-screen mode though)

[sabaatworld]

I'm not sure if I understand the HDR metadata part. Can you please explain?

[ClassicGOD]

I believe in both modes, the colors are being sent as 8-bit. The API used to capture the screen in either mode return 8-bit image, even if the screen is running in HDR mode.

If now they have added some APIs to capture HDR and Hyperion supports 10-bit colors, we can try to find some way to send it over, but I'm not sure about either of those.

Hi, total DX noob here but I noticed HDR colors being washed out so I came here to check if there is a solution in the works. From my research IDXGIOutput5::DuplicateOutput1 allows you to select output format including 10bit ones. I don't think Hyperion supports 10bit formats so probably the grabber would have to do some tone mapping.
There is a fork of Hyperion - https://github.com/awawa-dev/HyperHDR that aims to correct washed out images but only for USB Grabbers at this moment.

[ktaeleman]

I've opened a pull request that fixes HDR mode DX11 Capture.

#61