If you're having trouble or run into any bugs with the code, post a comment here! I will try to get back to you within a few days.

Adjust in-engine recoloured images in real-time. · By
Hi, this is working great so far, and the tool and its internal tutorial were very helpful. Thanks for making it! A few things initially confused me, which I am passing on since you might find them useful to know:
I initially misunderstood this as a tool to download in addition to Better Colorize for Ren'Py, but afaict it's an alternative, containing the same shading code, but with a code creation tool instead of code examples. I think both pages could be clearer about this.
The internal documentation assumes the user has better_colorize_examples.rpy and points the user to read that instead of your online tutorials etc, which confused me for a bit until I realised what was going on.
It's not really meant to be an alternative, though given the high number of dependencies the tool requires, I elected to package them up into one zip file to avoid users having to go to 5 different tool pages for all the dependencies (which seemed likely to bring its own set of issues).
I do appreciate the suggestion though; in particular, the tutorials weren't made at time of release so that is why they aren't linked at the moment. I'll note that for a future update!
EDIT: Someone gave me a fix, will leave my comment here in case anyone else hits the same problem:
camera:
mesh True matrixcolor SepiaMatrix()
Hello, I apologise if I'm missing something obvious since I don't understand shaders very well, but: I am having trouble applying a sepia filter (or any other colour transform) to images which have been edited via RGBColorize. My goal is to make everything onscreen sepia coloured. Currently I'm using "camera at sepia" where sepia is a transform using SepiaMatrix(), it makes everything sepia coloured except any images which have been edited via RGBColorize. I don't have the same problem when I edit the same images with other shaders or matrix colour transforms, so it seems to be RGBColorize specific. Is there some way to use RGBColorize differently, or a different way to make everything onscreen sepia coloured? I tried a shader based colour transform on the camera instead of a matrix based one and had the same problem.