der</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#function">-function <var>name</var></a></td>
    <td>apply a function to the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#fuzz">-fuzz <var>distance</var></a></td>
    <td>colors within this distance are considered equal</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#fx">-fx <var>expression</var></a></td>
    <td>apply mathematical expression to an image channel(s)</td>
  </tr>

  <tr>
    <td><a hre