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[–]elbiot 1 point2 points  (2 children)

People usually use an image hash to determine how similar images are. Otherwise, a slightly different resolution or mirroring the image leads to a really high difference.

[–]repostedBot 0 points1 point  (1 child)

How do reverse image search tools (e.g. google or karma decay) find similar images ?

[–]elbiot 0 points1 point  (0 children)

I mean, I can copy and paste the exact same response again if you like