Mortal Kombat 1 - HDR Optimized Settings (Patreon)

The game DOES USE/APPLY Xbox & Playstation HDR Calibration app settings.

The game has a good HDR implementation as it is actually applying the system-level HDR Calibration values while also providing a regular HDR Brightness/Gamma slider.

You can leave the "HDR SCENE SCALE" slider to Default / 50% as it already represent a balanced exposure/gamma.