s <var>distance</var></a></td>
    <td>analyze image features (e.g. contract, correlations, etc.).</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#fft">-fft</a></td>
    <td>implements the discrete Fourier transform (DFT)</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#fill">-fill <var>color</var></a></td>
    <td>color to use when filling a graphic primitive</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#filter">-filter <var>type</var></a></td>
    <td>use t