This looks fun. Does it need to be applied per image or can it be across an entire scene or screen?
Viewing post in Make Visual Novels! RenPy Shader Pack comments
It can be applied to an entire scene and all of its contents by applying it to a layer or camera, or you can apply it to individual elements like just a character sprite or a background or screen by assigning the transforms to them.
You can get more details about transforms over in the official RenPy docs if you have questions: