When there are photos that were edited with an external editor, and brought back, do you keep both? Also, some algorithms may not even see these as duplicates if they were saved in different formats.There may be similar photos, but in different resolutions or compressions.I'm not saying these things can't be overcome, but they shouldn't be overlooked. Unfortunately, there's always some complexity in removing duplicate photos. Photos have metadata associated with them-the device that captured it, etc.-and if the metadata between two visually identical photos is different, hashing the two photos would indicate that they’re different because the metadata’s different. There are also some harder questions with this.
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Thus they’d have to do the comparison on-device which would mean that every single photo in iCloud would have to be downloaded to the device and hashed for comparison, which defeats one of the purposes of iCloud Photo Library (to free up storage as it fills up without needing to worry about losing one’s photos). They can’t do this server-side because they can’t (well, they say they can’t) read the photos server-side. The chances of this happening across a photo library are slim, particularly for SHA-1, but even one deleted photo could obviously be really bad. The flipside that a couple of the most widely used hashing algorithms for tasks like this, MD5 and SHA-1, have documented “collisions,” where two inputs will produce the same output, which should theoretically never happen in a hashing algorithm. The most convenient way to remove duplicate photos would be to hash the photo files and look for duplicate hashes. This subreddit is not endorsed or sponsored by Apple Inc. If you'd like to view their content together, click here. This fundamental difference in audience is why we support two communities, r/Apple and r/AppleHelp. Apple SubredditsĬontent which benefits the community (news, rumors, and discussions) is valued over content which benefits only the individual (technical questions, help buying/selling, rants, etc.).
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