title: -webkit-filter's hue-rotate does not seem to produce correct results in chrome
body: <p>If I rotate the hue by 90deg using something like:</p>
  
  <pre><code>.foo
  {
    -webkit-filter: hue-rotate(90deg);
  }
  </code></pre>
  
  <p>it does rotate the hue, but it doesn't look correct. For instance, if I perform the same shift in photoshop I get different results. I also noticed that I get different results between Chrome and Safari.</p>
  
  <p>If I take a screenshot and open up the modified image (via the -webkit-filter) in photoshop, I can see that the hue is only rotated by about 60 degrees, and also the saturation has been reduced.</p>
  
  <p>Is there a way to get webkit browsers to rotate the hue more reliably, or am I missing something basic about this filter approach.</p>
  
  <p>Here is a fiddle demonstrating the issue:</p>
  
  <p><a href="http://jsfiddle.net/xv5Ah/1/" rel="nofollow">http://jsfiddle.net/xv5Ah/1/</a></p>