Filter that affect only certain objects

Is there a way do do post processing and apply a filter that only affects the terrain or certain objects?

Maybe something like:

if ( color.r > 0.01 && color.r < 0.9) {
}

Ideas are appreciated.

Thanks!

You would need something like skyrim's or fallout's ENB for something like that.
Reshade is for max compatibility, the best you can do is something todo with colour and try with the colorfilter shader.