From Droid Informatica:
PictMatch is a picture comparator. Detects duplicated pictures across different folders, by visual similarity (comparing brightness, hue and saturationpixel by pixel) or by exact byte-to-byte comparation.Pictures in different folders are also compared. Duplicatescan be deleted, renamed or moved to a directory. The programcan show you the duplicated pairs, or take the actionsautomatically, based on picture resolutions, size andcontrast. Optionally, the program can create a BAT fileinstead of taking the actions instantly. Report options areavailable. Help file and tutorial included.