NAME

       redshift - Set color temperature of display according to time of day.

SYNOPSIS

       redshift
        -l LAT:LON -t DAY:NIGHT [OPTIONS...]

DESCRIPTION

       redshift adjusts the 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 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.

OPTIONS

       -h     Display this help message

       -v     Verbose output

       -V     Show program version

       -b N   Screen brightness to apply (max is 1.0)

       -c FILE
              Load settings from specified configuration file

       -g R:G:B
              Additional gamma correction to apply

       -l LAT:LON
              Your current location

       -l PROVIDER
              Select  provider  for  automatic  location  updates  (Type  `list' to see available
              providers)

       -m METHOD
              Method to use to set color temperature (Type `list' to see available methods)

       -o     One shot mode (do not continuously adjust color temperature)

       -O TEMP
              One shot manual mode (set color temperature)

       -x     Reset mode (remove adjustment from screen)

       -r     Disable temperature transitions

       -t DAY:NIGHT
              Color temperature to set at daytime/night

       The neutral temperature is 6500K. Using this value will not change the  color  temperature
       of  the display. Setting the color temperature to a value higher than this results in more
       blue light, and setting a lower value will result in more red light.

       Default values:

              Daytime temperature: 5500K Night temperature: 3700K

       Please report bugs to <https://bugs.launchpad.net/redshift>

SEE ALSO

       The full documentation for redshift is maintained as a Texinfo manual.  If  the  info  and
       redshift programs are properly installed at your site, the command

              info redshift

       should give you access to the complete manual.

AUTHOR

       redshift was written by Martin Koelewijn and Jon Lund Steffensen.

       This  manual  page  was  created  by  Franziska Lichtblau <rhalina@old-forest.org> for the
       Debian project (and may be used by others).