A simple and configurable Blue Light Filter for X

blugon is a simple and fast Blue Light Filter, that is highly configurable and provides a command line interface. The program can be run just once or as a daemon (manually or via systemd). There are several different backends available. blugon calculates the screen color from your local time and configuration.

blugon's main feature is the ability to control gamma values or color temperature at specific times of day.

You can start blugon from the command line:

blugon

To run it in the background just use:

(blugon&)         # to start
killall blugon    # to stop

To run blugon with systemd you can enable the service as user:

systemctl --user enable blugon.service

You can use the current-mode to manually control color temperature (with keybinds for example; doesn't need daemon):

blugon --setcurrent="+600"    # for more blue
blugon --setcurrent="-600"    # for more red

For further help you can use the -h flag or the more intensive man-page:

man blugon

• -o or --once to apply gamma values of the current time
• -S or --setcurrent to set or change the current color temperature
• -s or --simulation to quickly simulate the configuration for the whole day
• -f or --fade to fade in screen color on startup
• -i [secs] or --interval=[secs] to set time between refreshes
• -c [path] or --configdir=[path] to specify configuration directory
• -b [backend] or --backend=[backend] to choose the backend for communication with X

• xgamma - most compatible, requires optional dependency
• scg - best result
• tty - to run blugon on your TTY

Examples for configurations can be found in /usr/share/blugon/configs/.

To use the default configuration as a template you can use:

mkdir -p ~/.config/blugon/
cp /usr/share/blugon/configs/default/gamma ~/.config/blugon/gamma
blugon --printconfig > ~/.config/blugon/config

• python
• libx11
• libxrandr

• xorg-xgamma as backend

There is an AUR-Package.

You can use the derivation from this nix-expression in nixpkgs.

If you are on Linux you can build and install:

make
make install    # as root

To change the target directory of the installation use the following and change /usr/local to the desired directory:

make PREFIX=/usr/local
make install PREFIX=/usr/local

Configuration is supposed to be done after installing.

Feel free to Fork, create Issues and make Pull Requests.

I am looking forward to finding Package Maintainers and will happily accept improvements in the source code.

A lot of functionality is being rewritten in blucontrol. If you have some Haskell knowledge feel free to try it out.

What it provides is fully functional, just the documentation is lacking.