I'm extending Processing's PImage class to add as many filters and effects as possible. I've found that programming filters, image adjustments, etc. is quite fun (for example doing an adjustment in Photoshop and trying to replicate it programmatically).

Right now the project has about 10 methods to modify the image, but I'd love to get people to program their own filter and add it there! This is the GitHub repo. Please fork, make pull requests, raise issues, etc.

https://github.com/fdansv/FilterPImage