Here is my take on the request presented here : reshade.me/forum/shader-suggestions/5890...niformity-correction

I wrote a simple shader for this problem, I tested it with a bad camera on my monitor with backlighting problems.

Here is my monitor without the shader (contrast is increased to show the imperfections) :


And here is with the shader applied (same contrast as before) :


Effect could be better with a good camera.

Shader and how to here :
https://github.com/AlucardDH/dh-reshade-shaders

Maybe, the effect will be different with a projector, feedback is welcomed.

Great idea! If you do color / imperfectionmask you can more accurately equalize the brightness and also maybe remove color imperfections, not only backlighting problems.