title: What are pixels and points in iOS?
body: <p>from UIImage reference:</p>
  <pre><code>@property(nonatomic, readonly) CGSize size
  </code></pre>
  <blockquote>
  <p>The dimensions of the image, taking orientation into account.</p>
  <p>Discussion</p>
  <p>In iOS 4.0 and later, this value reflects the logical size of the image and is <strong>measured in points</strong>. In iOS 3.x and earlier, this value
  always reflects the dimensions of the image <strong>measured in pixels</strong>.</p>
  </blockquote>
  <p>What's the difference between pixels and points in iOS?</p>