r>color</var></a></td>
    <td>border color</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#brightness-contrast">-brightness-contrast <var>geometry</var></a></td>
    <td>improve brightness / contrast of the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#canny">-canny <var>geometry</var></a></td>
    <td>use a multi-stage algorithm to detect a wide range of edges in the image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#caption">-caption <var>string<