        turns on black level subtraction</li>
      <li><strong>4channnels</strong> - splits RAW-file into four separate
        16-bit grayscale TIFFs (per RAW channel).<br>
        Command line switches:
        <ul>
          <li><strong>-s N</strong> selects N-th image from RAW with multiple
            images</li>
          <li><strong>-g</strong> gamma correction (gamma 2.2)</li>
          <li><strong>-A</strong> values autoscale by auto-calculated integer
            factor</li>
          <li><strong