cotemp is a simple program that uses Xrandr to apply a color temperature and/or brightness on every screen, or by selecting one with -s flag, every 60 seconds (by default).

Depending on the hour and minute defined in a profile, it will switch to that profile using it's respective temperature and brightness.

Profiles are located in config.h.

With no arguments cotemp will start to run (forever).

cotemp [-dlv] [-s screen] [-c crtc] [-t temperature] [-b brightness] [-p profile]

For a more detail information read the man page.

Edit config.mk to match your local setup (cotemp is installed into the /usr/local namespace by default).

Afterwards enter the following command to build and install cotemp (if necessary as root):

make clean install

• This is a fork of sct which implemented a lot of things like:

  • Aproximation of the table of resfhit
  • iterate over all screens
  • clean up code

• Original code was published by Ted Unangst in the public domain: https://www.tedunangst.com/flak/post/sct-set-color-temperature

• The following website by Mitchell Charity provides a table for the conversion between black-body temperatures and color pixel values: http://www.vendian.org/mncharity/dir3/blackbody/

• Redshift and flux.