
    <td>apply a median filter to the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#mean-shift">-mean-shift <var>geometry</var></a></td>
    <td>delineate arbitrarily shaped clusters in the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#metric">-metric <var>type</var></a></td>
    <td>measure differences between images with this metric</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#mode">-mode <var>radius</var></a></td>
    <td>make each pixel 