</var></a></td>
    <td>set an image attribute</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#shade">-shade <var>degrees</var></a></td>
    <td>shade the image using a distant light source</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#shadow">-shadow <var>geometry</var></a></td>
    <td>simulate an image shadow</td>
  </tr>

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

  <tr>
    <t