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  • Any assumptions on browsers or server technologies? Like are you expecting this to work in IE7? And do you have a server like ASP.NET or PHP? Commented Jul 9, 2013 at 16:42
  • A client side only HTML5/js solution would be interesting. Commented Jul 9, 2013 at 16:46
  • An interesting thread on how iTunes does this based on the album cover art: stackoverflow.com/questions/13637892/… There's some code examples written in Mathematica, which you could use as a base for your own experimentation. Commented Jul 9, 2013 at 16:48