Lut Chromakey? I dont know

so, my idea is a shaders that detects a color and turns it into a png / gif, like a Chromakey but with a bit of Lut?



Example:Let's say you chose the color red, then the shader will detect the color red and make it there in the png / gif you chose, for example the image of a Cat


(Its my first time doing this on that forum if i make something wrong im really sorry) byeeee

This thread should get you started: reshade.me/forum/shader-presentation/619...nd-other-stuff#38556