title: UIImage get retina size
body: <p>I want to know how can a retrieve a UIImage size, depending on the type of display that I'm using. </p>
  
  <pre><code>UIImage * refimg = [UIImage imageNamed:@"people-there.png"];
  NSLog(@"SIZE: %f",refimg.size.height);
  </code></pre>
  
  <p>The output is </p>
  
  <pre><code>SIZE: 62.000000
  </code></pre>
  
  <p>... on both iPhone 3gs and iPhone 4g. I have the image "people-there@2x.png" in the same directory as "people-there.png"</p>
  
  <p>How can I get "SIZE: 124.000" on retina display?</p>
  
  <p>Thanks in advance, </p>
  
  <p>Lucas. </p>