There is some ideas I have in mind about G’MIC. Filters specifically designed to reverse engineer images to use as an aid to develop a filter. The easiest I can think of to demonstrate what I mean by reverse engineering filters is reverse engineering gradient mapping.
In the video, you should see that I am trying to reverse engineer gradient map by looking at the smoothest possible gradient first, and then using that on the lower layer, and finally applying a non-destructive filter. Then, if I see that they are very similar, then I conclude that it is possible to make a gradient map, and reapply the effect again on other image, and still get super similar result.
There’s also something like this for color adjustment for GIMP way before.
What are your thoughts on this idea? It’s not going to magically extract filters from images, but it is only for creating one-filter using existing info.