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A screen in F.lux's "darkroom mode" On installation, the user can choose a location based on geographic coordinates, a ZIP code, or the name of a location.The program then automatically calibrates the device display's color temperature to account for time of day, based on sunrise and sunset at the chosen location.
Redshift can be used to set a single color temperature and brightness ("one shot mode") or can adjust the temperature and brightness continuously to follow the sun's elevation, in which case it will transition to the night color temperature settings near twilight. The temperature and brightness settings for daytime and night can be user-configured.
For a CRT, the gamma that relates brightness to voltage is usually in the range 2.35 to 2.55; video look-up tables in computers usually adjust the system gamma to the range 1.8 to 2.2, [1] which is in the region that makes a uniform encoding difference give approximately uniform perceptual brightness difference, as illustrated in the diagram at ...