   <td>negate all pixels above the threshold level</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#sort-pixels">-sort-pixels</a></td>
    <td>sorts pixels within each scanline in ascending order of intensity</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#splice">-splice <var>geometry</var></a></td>
    <td>splice the background color into the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#spread">-spread <var>radius</var></a></td>
    <td>displace imag