          </li>
          <li>Bits 2-4 - the orientation of the image (0=do not rotate, 3=180,
            5=90CCW, 6=90CW) </li>
        </ul>
      </li>
      <li>black_level: file black level (it also may be specified via
        imgdata.params) </li>
    </ul>
    See samples/openbayer_sample.cpp for usage sample (note, this sample is
    'sample only', suited for Kodak KAI-0340 sensor, you'll need change
    open_bayer() params for your data).
    <p><a name="unpack"></a></p>
    <h3>int LibRaw::unpac