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).