title: Corona: Image cropping
body: <p>how to crop an image selected from camera roll in corona sdk?</p>
  
  <p>I have tried masking <a href="http://developer.coronalabs.com/code/useful-crop-library" rel="nofollow"> following this tutorial</a> 
  but this gives me colored background with my cropped image on it. I need cropped image alone. </p>