title: question about photographic effects on iphone
body: <p>I'm interested in implement of photographic effects on iphone.
  Taking <a href="http://itunes.apple.com/us/app/id329670577?mt=8" rel="nofollow">Camera+</a> as an example, I'd like to know how to do the function of "Scenes", "Effects" and "Borders".</p>
  
  <p>I'm fresh about it and just know it is in image processing domain.
  I'd like to know where to start if I want to do it myself on iPhone.
  Can you give any tip?</p>
  
  <p>thanks!</p>