ImageComparitor is a utility for Mac OS X and Windows (technically everything since it's a Java program) designed to compare pictures/image files inside a folder for duplicate images (based on file hash) and remove excess duplicates (while retaining you
Can't select which image to delete.
Works in finding duplicates in a single directory, and yes it offers a preview. But the preview window doesn't provide any details about the two images. Date taken? File size? Image size? Please give us more info and give the option of choosing which one to keep.
Works as described, but seems limited to a single directory. Unable to select which duplicate file to delete, and duplicates must be in or under the directory you are scanning.