What's weird about the HDR in this game, is they don't have an adjustment for the UI's luminance. I think this is what is throwing everyone off into believing that HDR is not enabled. So then they go the other way, and actually disable HDR and when that causes the image to blow-out and brighten everything -- UI included -- they conclude that they've now enabled HDR.
I think the game may be taking the SDR reference level defined in the Windows HDR Color control panel (that slider you have to adjust) and using it for the game's HUD luminance target. I would do that in my own software, except only UWP DLLs can read those system preferences.
In any event, make sure to play the game in Borderless mode if you want HDR to work correctly. In Fullscreen mode, it does not change the colorspace, it will be SDR in a 16-bit framebuffer.
I think the game may be taking the SDR reference level defined in the Windows HDR Color control panel (that slider you have to adjust) and using it for the game's HUD luminance target. I would do that in my own software, except only UWP DLLs can read those system preferences.
In any event, make sure to play the game in Borderless mode if you want HDR to work correctly. In Fullscreen mode, it does not change the colorspace, it will be SDR in a 16-bit framebuffer.
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