The 'similar shape' algorithm works on distance. On the normal 'new page' selection window, hit special->duplicates processing. This all starts on- the duplicates processing page ¶ For instance, if you say that file A is a duplicate of B and B is a duplicate of C, A and C are automatically recognised as duplicates as well. All of your decisions build up in the database to form logically consistent groups of duplicates and 'alternate' relationships that can be used to infer future information. Once these pairs of potentials are found, they are presented to you through a filter like the archive/delete filter to determine their exact relationship and if you want to make a further action, such as deleting the 'worse' file of a pair. Hydrus finds potential duplicates using a search algorithm that compares images by their shape. It currently works on still images, but an extension for gifs and video is planned. Along the way, it would be nice to merge your ratings and tags to the better files so you don't lose any work.įinding and processing duplicates within a large collection is impossible to do by hand, so I have written a system to do the heavy lifting for you. Some will be interesting alternate versions that you want to keep, and others will be thumbnails and other low-quality garbage you accidentally imported and would rather delete.
Even if you have a very restrictive importing workflow, your client is almost certainly going to get some duplicates. As files are shared on the internet, they are often resized, cropped, converted to a different format, altered by the original or a new artist, or turned into a template and reinterpreted over and over and over.
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