If you're really wanting to do perceptual hash based deduplication, use multiple, heterogeneous hash algorithms (phash, dct hash, mean hash, ...) as it is likel

If you're really wanting to do perceptual hash based deduplication, use multiple, heterogeneous hash algorithms (phash, dct hash, mean hash, ...) as it is likely that a given hash algo will happily lossily match with very very different images--but if all hashes match, you're much less likely to have false positives. I wrote up what I do here: https://photostructure.com/guide/what-do-you-mean-by-deduplicate/ https://photostructure.com/guide/what-do-you-mean-by-dedupli...