The proportion of these 225 pixels which match are used to determine the similarity. However, one that does (dupeGuru) works by creating a very low resolution 15 x 15-pixel version of each input image and comparing pixel color components. There are many possible algorithms for detecting similarity in photos and most software does not give any detail of how it operates. Document management systems address this issue with their check in/check out facility, but they are not universally deployed, and even if they are available, users may not make use of them. “You didn’t pick up my changes!” is a frequent accusation in this situation. Collaborative authoring is very common within organizations and there are often difficulties in finding the latest version of a collaboratively authored document before it is released outside the organization.
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