Depth based saturation.

Later one night a few days ago I though it would be cool to have a depth buffer based saturation.

The basic idea been either desaturate after a certain distance or use a texture like those 256x1 textures that were used by old reshade 2.0 colour correct shaders.
Though I liked the idea of been able to control the saturation of the foreground and background.

I would like to do the shader my self but my head hurts trying to do math.

using normal lut with depth buffer you can this
if you can make