Assuming that a typical image has 243.3 k Bytes, or 1 993 221 bits. And that a 
hash has 64 bits.

Then there are 2^1 993 221 different images, and 2^64 hash values.
One hash value is thus shared on average by 2^1 993 157 images. =  (2^10)^199 
315.7 = 10^600 000

So it does not look so very unlikely that two different images might share a 
hash value.

Or did I make some mistake?

Gerriet.


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