Gotham Knights - HDR Settings

The peak brightness in the game seems to be fixed and not adjustable. This game does not seem to use the PS4, PS5 and Xbox system calibration settings. 

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The peak brightness limit is about 1000 nits.  If your TV brightness is very different from 1000 nits, then use the tone mapping modes of your TV.

The Brightness slider adjusts the overall brightness of the image, as in SDR mode (does not affect peak brightness).

The Contrast slider adjusts the contrast (black level). Adjust sliders as you wish.