Getting Rid of Duplicate Images on your Computer

duplicate photographs to that folder instead of deleting them.
Now Picasa is a good solution for deleting identical duplicates but your disk may also be storing have pictures that look similar visually but may differ as far as pixels or bytes are considered. Such files won’t be recognized by Picasa as duplicates but VISIPIK, a tiny utility for Windows, can come really handy here.
2. Deleting Similar Images
To get started, launch the program and click File –> Add Folder to add folder(s) that you want to scan for duplicates. Then slide the Filter to somewhere between “Strict” and “Basic” so that program may group images that are similar or only slightly different. Hit play to begin scanning for duplicates.

To eliminate the duplicates, just move your mouse over the thumbnails and left-click the pictures you want to delete. They’ll be marked with a recycle bin icon and you may then either choose “Delete” or even “Move” to transfer them to a separate folder.
The tool is also smart enough to auto-select images for deletion that either have lower resolution or lower file-size than the original image.

Source- www.labnol.org