How to create graphic effect/filter mod?

[3tt3r4g1c]

Hello! I want to create a small mod that will add a graphic effect to the game, change color balance maybe, stuff like that, but most of the manuals is about adding an items to the game or map editing, so I'm kind of clueless. I would appreciate too see a full explanation on how add such filters to the game, if anybody got that experience, or just a tips where to start would be good too
 Is there any soft for that kind of modding maybe? 
(I can figured out how to create an effects it self, but I very confused about how to add it to the game as a mod, which format to use, how is that kind of graphic mods work, etc.) 

Edited August 20, 2022 by 3tt3r4g1c