title: UIImageView scaling/interpolation
body: <p>I have a small IPhone app that I am working on and I am displaying an image with a UIImageView.  I am scaling it up using the Aspect Fit mode.  I would like to have the image scale up with no interpolation/smoothing (I want it to look pixellated).  Is there any way I can change this behavior?  </p>
  
  <p>A little more general question would be can I implement my own scaling algorithm, or are there  other built in ones that I can select?</p>