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Shuugo said:
Saying MD5 are easy to find dupes is lol, if it would be really an effective way to finding dupes we wouldn't have the iqdb image similarity check on upload.

Meh
Considering how many version can be on the internet, meaning crappy Minitokyo, high quality, sample, and any file format, resolution... well yeah, MD5 for dupe is not really effective IMO. Usually I rely on my memory, but there are some duplicate detector software that should be able to do the job.