title: What triggers "Color Copied Images" and "Color Hits Green and Misses Red" in Instruments?
body: <p>The <a href="http://developer.apple.com/library/ios/#documentation/DeveloperTools/Conceptual/InstrumentsUserGuide/Built-InInstruments/Built-InInstruments.html%23//apple_ref/doc/uid/TP40004652-CH6-SW47">Instruments User Guide</a> has this to say:</p>
  
  <blockquote>
    <ul>
    <li><strong>Color Copied Images.</strong> Puts a cyan overlay over images that were copied by Core Animation.</li>
    </ul>
  </blockquote>
  
  <p>But that doesn't explain <em>why</em> an image got copied. There doesn't seem to be an obvious pattern from one copied image to another, although it is regular and reproducible.</p>
  
  <p>The docs currently don't even mention <em>Color Hits Green and Misses Red</em>, but I'm thinking it might have something to do with <code>CALayer</code>’s <code>shouldRasterize</code> property.</p>
  
  <p>Any ideas?</p>