Blue Light Filter on Wayland

Using a blue-light filter makes it easier to look at a computer screen late into the night.

I previously described how to use redshift on classic X11 in this article: Blue Light Filter using Redshift.

However, a redshift doesn't work with wayland based windowing systems like sway (based on wl_roots).

An alternative program that works in (practically) the same way is called gammastep.

Just like redshift, to enable the filter with a set color temperature:

gammastep -O 4500 &

Where 4500 is the desired color temperature (4500k in this case).

To disable, just run

gammastep -x