al-blur <var>geometry</var></a></td>
    <td>non-linear, edge-preserving, and noise-reducing smoothing filter</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#black-threshold">-black-threshold <var>value</var></a></td>
    <td>force all pixels below the threshold into black</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#blue-primary">-blue-primary <var>point</var></a></td>
    <td>chromaticity blue primary point</td>
  </tr>

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