Copyright © 2020 by Paul Wilhelm <anfrage@paulwilhelm.de>
Compares all JPEG images in a folder and renames (enumerates) duplicates. Differences in resolution and quality don't matter!
This program loads all images in a folder, generates grayscale thumbnails and calculates the cross-image power.
It then renames (enumerates) similar image pairs such that you can examine and delete the duplicates afterwards.
The DUP_xxxx_A_… files should always be the bigger ones, so you are probably safe to delete the DUP_xxxx_B_… files.
Tested with Python 3.8 in Ubuntu 20.04
Note: You should upgrade pillow if you get metadata errors: python3 -m pip install pillow --upgrade