Color correction for colorblind people
There is a Colorblind Filters Extension, that should help color blind users, but of course, would like to have these settings in GNOME out-the-box.
Shaders from this extension available from repository https://github.com/G-dH/gnome-colorblind-filters/blob/main/shaders.js So I think it's not hard to implement, we just need to think about the design.
I think that before designing Color Correction settings, it would be nice to check out how this is implemented in different operating systems.
Color correction settings in Android.
In iOS it's done in the same way, but there also are several pictures for color vision test.
In PlayStation 5 color filter settings, it is possible to adjust Color Correction Intensity.
I made these rough mockups as an example, I think it would be better if the Color Filter settings were in a separate window.
Of course, @aday @bertob know better how it should be, so I'm interested in their opinions.