title: Show Blended Layers reveals red UIImage but it does not have an alpha channel
body: <p>I have an image that does not have an alpha channel - I confirmed in Finder's Get Info panel. Yet when I put it in a <code>UIImageView</code> which is within a <code>UIScrollView</code> and I enable Show Blended Layers, the image is red which indicates it's trying to apply transparency which will be a hit on performance. </p>
  
  <p><em>How can fix this to be green so iOS knows everything in this view is fully opaque?</em></p>
  
  <p>I tried the following but this did not remove the red color:</p>
  
  <pre><code>self.imageView.opaque = YES;
  self.scrollView.opaque = YES;
  </code></pre>