Koreader my friend
I found this library worked extremely well for finding and removing similar images https://github.com/elisemercury/Duplicate-Image-Finder Maybe this doesn't fulfill your main and temp folder requirements but worth a try.
Koreader my friend
I found this library worked extremely well for finding and removing similar images https://github.com/elisemercury/Duplicate-Image-Finder Maybe this doesn't fulfill your main and temp folder requirements but worth a try.