title: PECL Imagick adaptiveSharpenImage not working?
body: <p>I'm trying to sharpen my images using this function, but it's not working.  Whatever values I pass in for radius and sigma I get an identical image (same file size even) out.</p>
  
  <p>It returns a 1 suggesting no error.  What might be going wrong here?</p>
  
  <pre><code>$photo = new Imagick(PHOTOS_DIR.$sFilename);
  $photo-&gt;adaptiveSharpenImage(2,1);  //4,2 ... 0,10, 0.5,0.5 - all give identical results
  $guid = md5(uniqid(rand(),true));
  $photo-&gt;writeImage(PHOTOS_DIR.'/temp/'.$guid.'.jpg');
  </code></pre>
  
  <p>I tried passing in <code>imagick::CHANNEL_BLUE</code> for the optional third parameter, it made no difference.</p>
  
  <ul>
  <li>CentOS 6.5</li>
  <li>PHP 5.5.12</li>
  <li>pecl-imagick 3.1.2</li>
  <li>imagemagick 6.5.4</li>
  </ul>