Find Duplicate Files – Photos, Images and Pictures using content comparison
Free download:
http://www.mindgems.com/products/VS-Duplicate-Image-Finder/VSDIF-About.htm
Visual Similarity Duplicate Image Finder will find all similar and duplicate images in a folder and its sub folders.
It uses advanced algorithms in order to find similar images in a way that a human does.
Due to that fact it can find similar images even if they are in different image formats and sizes.
More Free tools:
http://www.mindgems.com/
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