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FotoAlbum Professional provides a method for identifying and removing duplicate images or videos. It uses the CRC value that is computed when building a thumbnail to accurately identify any images that are duplicated. The detection process requires that the image be 100% identical in order to be detected. Any modifications made to files that alter the file data will ensure it is not detected as a duplicate (even though two images may appear very similar).
A complete listing of all duplicate images detected within your picture folder is displayed. From this screen you can choose whether or not to "merge" duplicates. Merging of duplicates will combine the attributes of the images (captions, picture dates, keywords, albums, etc) and then remove the extra files. You will end up with a single image that has the combined attributes of the duplicate image(s).