title: How to give sketch effect on image in iphone?
body: <p>I am implementing an iPhone application, in which I have implemented the following functionalities:</p>
  
  <ol>
  <li>Select photo</li>
  <li>Capture photo</li>
  <li>Now I want to give a sketch effect to that photo like <a href="http://itunes.apple.com/in/app/photo-to-sketch/id421785759?mt=8" rel="nofollow">this one.</a></li>
  </ol>
  
  <p>How could I do this?</p>