This question already has an answer here:

I am curious how Stack Overflow generates profile pictures randomly in cute way. What is the best way to achieve that? What tools or programming knowledge I should know?

marked as duplicate by slhck, Hugo Dozois, Shadow The Princess Wizard, Adam Lear May 7 '13 at 13:10

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migrated from stackoverflow.com May 6 '13 at 17:47

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    gravatar.com – Antony May 6 '13 at 17:53
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    I don't see how this belongs on Meta. It's not specific to the Stack Exchange sites and (at the root) a programming problem. – slhck May 6 '13 at 17:56
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    @slhck: The solution is likely to be more general, but the question is about Stack Exchange, and a Stack Exchange specific answer would presumably be acceptable. – Keith Thompson May 6 '13 at 18:02
  • See also: en.wikipedia.org/wiki/Identicon – hammar May 6 '13 at 18:20
  • @slhck It could go either way. Having this on meta is probably the safest, actually, considering that Stack Overflow generally frowns on "what tools do I need to do something like website X does it" type of questions. – Adam Lear May 6 '13 at 20:06
  • @Anna Of course. I hope it didn't sound like I wanted this particular version of the question to stay on SO either. – slhck May 6 '13 at 21:09
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    @slhck the OP had no clue that Stack Overflow is using Gravatar, this question is totally legitimate here in my opinion. Now that he knows he might ask "How Gravatar generates the dynamic picture?" and this indeed won't belong here. – Shadow The Princess Wizard May 7 '13 at 12:06

It's a site called Gravatar that provides that service.

It generates those images from your email address or your IP address...

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