eshold <var>low-black, low-white, high-white, high-black</var></a></td>
    <td>perform either hard or soft thresholding within some range of values in an image</td>
  </tr>

  <tr>
    <td><a href="command-line-options.html#read-mask">-read-mask <var>filename</var></a></td>
    <td>associate a read mask with the image</td>
  </tr>

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

  <tr>
    <td><a href