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This plugin filters duplicate images using perceptual image hashing.

Forum thread: https://tt-rss.org/forum/viewtopic.php?t=3850
Hashing library: https://github.com/jenssegers/imagehash
Count bits extension for PostgreSQL: https://github.com/sldab/count-bits

Git clone to (tt-rss)/plugins.local/af_zz_img_phash