Sometimes you may not have organised all the folders in your hard disk well and so there may be lots of duplicate photos (same content with different name).Here is a freeware designed to locate duplicate photos on your hard disk.
Dup Detector finds duplicate and near duplicate images by opening and reading image pixel data. The program is easy to use, just specify the path and start the scan. You can specify a match % that is required to consider the image a duplicate and preview all found dups side by side with an option to delete either one.
To get the software click here
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