![]() In addition to a windowed interface, it provides a tray status icon that can enable or disable Redshift or adjust the screen's color temperature automatically. Redshift-gtk is included in Redshift's source tree. Those GUIs include redshift-gtk, redshift-plasmoid, and nightshift. Redshift originally possessed only a command-line interface, but now has graphical user interfaces (GUIs) that support most Linux desktop environments. Because Redshift can only be configured to use the same gamma correction on all monitors it controls, it is usually desirable to run one instance of the program per monitor. On Linux and BSD operating systems, Redshift supports multiple monitors through the X extensions RandR (preferred) or VidMode, or through the Direct Rendering Manager. To determine the Sun's elevation the software requires the user's location in form of latitude and longitude. The temperature and brightness settings for daytime and night can be user-configured. 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. Redshift is primarily distributed for and used on the Linux operating system. Typical color temperature during the daytime is 5500–6500 K. ![]() At night, the color temperature is low and is typically 3000–4000 K, preferably matching the room's lighting temperature. Redshift transitions the computer display's color temperature evenly between daytime and night temperatures to allow the user's eyes to slowly adapt. The program is free software, and is intended to reduce eye strain as well as insomnia (see Sleep#Circadian clock and Phase response curve#Light). Redshift is an application that adjusts the computer display's color temperature based upon the time of day. ![]()
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