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@@ -0,0 +1,46 @@ + +Redshift +======== + +Adjust color temperature of your screen according to your +surroundings. This may help your eyes hurt less if you are working in +front of the screen at night. + +The program uses the RANDR extension of the X server to adjust the +color temperature. This is done by setting appropriate gamma ramps. If +you have configured your own gamma ramps they will be overwritten +but in that case you probably care too much about color accuracy +to use this program anyway. Your graphics driver and X server needs to support +at least RANDR version 1.3. + +The color temperature is set according to the position of the sun. A +different color temperature is set during night and daytime. During +twilight and early morning, the color temperature transitions smoothly +from night to daytime temperature to allow your eyes to slowly +adapt. At night the color temperature should be set to match the lamps in your +room. This is typically a low temperature at around 3000K-4000K +(default is 3700K). During the day, the color temperature should match +the light from outside, typically around 5500K-6500K (default is +5500K). The light has a higher temperature on an overcast day. + +Currently, the program will not continously update the color +temperature but will only do so once. One way to continously update +your screen is by running: + + $ watch -n 5 -- redshift <OPTIONS..> + +The command line options are explained in the following paragrphs. The +only required parameter is your current location, all other options +have reasonable defaults. + + -g R:G:B Additional gamma correction to apply. Can also be + specified as -g GAMMA to set all channels to the same + gamma value. + -h Display help message. + -l LAT:LON Your current location in latitudes and longitudes. + -t DAY:NIGHT Color temperature to set at daytime/night. + -v Verbose output. + +Example (location is Copenhagen, Denmark): + + $ redshift -l 55.7:12.6 -t 6800:3500 -g 0.8 -v |