The Witness - HDR Settings

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

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The brightness of the environment while walking does not exceed 800 nits. But the brightness of the puzzles can reach 3100 nits. If your TV's peak brightness is much greater than 800 nits, use your TV's tone mapping modes.