Handling Duplicate Images
Do you have duplicate images? Here is how Tag That Photo handles them (today). We create a signature on each image (the pixels of the image and not the metadata) so we can tell whether an image is a duplicate. If we find duplicates, we only edit metadata and face tags on the "set" of duplicates. So if you add a face tag "Mary" to one of the images - it will be written to ALL of the images.
There are some situations where a person's organization structure forces duplicates. For example, let's say that Mary and John are in the same photo "image001.jpg". Some people like to keep a copy of the image under a folder named "Mary" and another copy under a folder named "John". In this case duplicates are wanted!
However, there are other situations where you want to remove duplicates - and there are a variety of programs that can be used to remove duplicates. The advantage that some of these programs offer is finding "similar" images - including ones that have been downsized or with slight modifications to color or brightness for example.
This list is not exhaustive, and a few Google searches may find some others:
If you delete duplicates, as long as at least one of the images remains under a monitored Tag That Photo folder, then your metadata is safe.
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