I was working on a image editor on the browser, https://victorribeiro.com/customFilter
Right now the neat future it have is the ability of running custom filters of varied window size of images, and use custom formulas to blend several images
I don't have a tutorial at hand on how to use it, but I have a YouTube video where I show some of its features
https://youtube.com/playlist?list=PL3pnEx5_eGm9rVr1_u1Hm_LK6...