Why don't you provide a tool that combines all the three tools in one?
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Because they compare file data - not file content. That is why the standard duplicate finders can not identify photos stored in different image formats. If the same photo is saved in two different image format its binary data stored in the files is completely different - same as for the audio files. Visual Similarity Duplicate Image Finder performs true image analysis and can find similar and duplicate images even if they are stored in different image formats.