If($f =~ m|\.$| or $f =~ m|\.$|) \K.*': same as above but add a blank line before each group of identical MD5 hashes ( -all-repeated=prepend), then use sed to delete these blank lines and the first line after it (i.e. If you are looking to identify images where the image data is identical but the metadata differs (rotation is usually noted just in the metadata), here is a script I have used in the past: find -type f -a '(' \ I found that a burst of images taken in raw mode on a standalone camera were marked as duplicates by Photos: the burst was so fast that the four images, named differently, were taken within the same second and had nearly identical poses among the subjects.Compute the hash of each image without the metadata In other cases, it might be more subtle: the location is missing from one image but present in the other, or they’re identical except one is slightly downsampled. That reformulated image appears identical, and Photos marks such images as duplicates. For instance, if you post a photo via Instagram in iOS, Instagram makes a copy at a lower resolution which most metadata removed. In some cases, you might find that you have a low-resolution or metadata-scrubbed version of an image alongside one at higher resolution or with more embedded data.
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