title: invert colors of Image
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1698971/uiimage-color-changing">UIImage color changing?</a>  </p>
  </blockquote>
  
  
  
  <p>I have one image with Grey and white color.I want to change Grey color to white and change white color to Grey through code dynamically. Please help. </p>