HDR support

HDR support refers to the functionality of the game to output the rendered image in a wide-gamut format, typically known as HDR (high dynamic range). The first functionality for this format was added to Star Citizen Alpha 3.20.0 in an experimental phase. Until then, only SDR (standard dynamic range) output was supported.

Set up

 * An HDR supported monitor is required.
 * Windows 10 or 11 required.
 * In Windows settings > System > Display, "Use HDR" must be on.
 * Usage of third party overlays or post-processing (such as reshade) is not recommended.
 * HDR Brightness (Ref-White) refers to the preferred brightness of the UI elements and menus, aka paper-white. This defines the overall mid-tones of the game.
 * HDR Peak Brightness refers to the maximum brightness the monitor can support, in nits. This setting should default to the value that windows reports about the monitor.
 * The best HDR experience is achieved in a dark viewing environment,
 * for monitors with a rated peak brightness of 1000 nits, Brightness (ref-white) should be around 150-200 nits,
 * for monitors with a rated peak brightness of 400 nits, Brightness (ref-white) should be below 120 nits,
 * the lower you can keep the ref-white value, the more headroom you have for strong highlights, giving you a better HDR experience in general.

Experimental
The feature is still experimental, and is therefore not fully implemented yet. The game still uses the bt709/rec709 colour space for defining the primaries, PQ HDR colour space defines the brightness/gamma encoding. This means that the game technically does not use a wide-gamut color space yet.