title: iOS: Ken Burns animation implementation requires unexpected parameters
body: <p>I have a UIImageView I'm trying to animate a Ken Burns-like pan/zoom on. I want to start centered on a face (specifically, say, the end of the person's nose) and zoom out to the full size of the image. The code is something like:</p>
  
  <pre><code>image.frame = // some frame that zooms in on the image;
  image.center = // tip of the nose
  
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:3];
  [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
  
  image.frame = // original frame
  image.center = // original centerpoint
  
  [UIView commitAnimations];
  </code></pre>
  
  <p>In Photoshop the tip of the nose's coordinates are <em>completely</em> different from the values I've had to punch into the above code to actually center the image on the nose when the animation begins. I have tried reflecting the axes, multiplying by a factor of the scale... and I cannot seem to figure out why iOSs numbers are significant v. the ones I deduced from Photoshop.</p>
  
  <p>Can someone point out the discrepancy between the two coordinate systems?</p>
  
  <p>Some additional information:</p>
  
  <ul>
  <li><code>image</code> is a UIImageView and is an immediate child of a UIViewController</li>
  <li>Said UIViewController is oriented horizontally - the entire app runs in landscape mode.</li>
  </ul>