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> Clustering of files by similarity using a similarity hash function.

Does that mean that I can store all those 100s of photos taken at slightly different angles, in an efficient way?

That depends on whether they are bytewise similar, which in turn depends on the details of the image encoding of the format you’re using. I would expect that, by default, no.

That does lead to the question whether, with enough files, storing a lot of similar photos in uncompressed png is more space efficient in DwarFS than it is storing them in jpg.

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