REDSHIFT:(1)

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 continously 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

EXAMPLE
Example for Copenhagen, Denmark:

    $ redshift -l 55.7:12.6 -t 5700:3600 -g 0.8 -m vidmode -v

AUTHOR
redshift was written by Jon Lund Steffensen <jonlst@gmail.com>.

Both redshift and this manual page are released under the GNU General Public License, version 3.

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

KNOWN ISSUES
Redshift won’t affect the color of your cursor when your graphics driver is configured to use hardware cursors. Some graphics drivers have an option to disable hardware cursors in xorg.conf.