Reduce retinal rivalry and color shimmering in anaglyph 3D rendering mode by using filters

[Hiradur]

Problem

The current anaglyph rendering mode has seemingly no filtering applied, which leads to color shimmering and retinal rivalry.

Solutions

The Dubois filter is a renown filter that aims to reduce retinal rivalry and ghosting to increase eye comfort. IMO it leads to a much more pleasant viewing experience. I suggest to add it as an additional option for anaglyph rendering.

Alternatives

A new anaglyph filter specifically for gaming has recently been developed: Rendepth. I haven't tried it but I think it's worth a look. Apparently the idea is to build on the ideas of the Dubois filter, which was originally developed for CRTs, to account for the properties of LCD screens and introduce gamma correction for individual color-channels to improve color reproduction.

Additional context

Please note that the following screenshots have to be viewed through regular red/cyan anaglyph glasses to appreciate the difference.

Red/Cyan Anaglyph using the current anaglyph renderer in Minetest:

Red/Cyan Anaglyph created by applying the ffmpeg dubois filter to an side-by-side stereo-rendering from Minetest:

[lhofhansl]

I can confirm that the second image is much easier to look at through red/cyan glasses.
What is described in the linked article is not hard to add as a post processing step.