void LibRaw::rollei_thumb()
{
  unsigned i;
  ushort *thumb;

  thumb_length = thumb_width * thumb_height;
  thumb = (ushort *)calloc(thumb_length, 2);
  merror(thumb, "rollei_thumb()");
  fprintf(ofp, "P6\n%d %d\n255\n", thumb_width, thumb_height);
  read_shorts(thumb, thumb_length);
  for (i = 0; i < thumb_length; i++)
  {
    putc(thumb[i] << 3, ofp);
    putc(thumb[i] >> 5 << 2, ofp);
    putc(thumb[i] >> 11 << 3, ofp);
  }
  free(thumb);
}
Unknown