> There's also not that many possible images anyway, there's 8 rows with 8 columns, and 4 possible colours for each pixel. Even not assuming any fuzzy matching

> There's also not that many possible images anyway, there's 8 rows with 8 columns, and 4 possible colours for each pixel. Even not assuming any fuzzy matching (human comparison) it's still very possible to generate keys with colliding image hashes. Uh, 4^(8*8)=2^128 is a pretty large number.