Use color profile to implement a night mode

[Cassidy James Blaede]

We should add a redshift/f.lux-like night mode using display color profiles. We would need to calculate the current color profile, and make several gradually-red-shifted versions and handle switching to them based on the local time and local sunset.

[Cassidy James Blaede (cassidyjames)]

Affects Switchboard Displays Plug since we'd likely want to make it toggleable.

[Antonio Camargo (antoniop-camargo)]

There's a GNOME bug for that, maybe there's something useful:
https://bugzilla.gnome.org/show_bug.cgi?id=741224

Here are some mockups:
https://raw.githubusercontent.com/gnome-design-team/gnome-mockups/master/system-settings/displays/displays-v4.png
https://raw.githubusercontent.com/gnome-design-team/gnome-mockups/master/system-settings/displays/displays-v3.png
https://raw.githubusercontent.com/gnome-design-team/gnome-mockups/master/system-settings/displays/sleep-assistance.png

[Antonio Camargo (antoniop-camargo)]

Insted of applying a gradient of color profiles, would it be possible to use Redshift as a backend? It offers gamma correction, setting the screen temperature, several methods of color ajustment etc.