ions (option valid
            only for -q 4, i.e. for DCB demosaic).</dd>
          <dt><strong>-dcbe</strong></dt>
          <dd>Turns on DCB color enhance mode (only for DCB demosaic, -q 4).</dd>
          <dt><strong>-aexpo e p</strong></dt>
          <dd>Turns on exposure correction. e is exposure shift in linear scale
            from 0.25 (darken 2 stops) to 8.0 (lighten 3 stops). p is highlights
            preservation amount from 0.0 (no preservation, full clipping) to 1.0
            (full preser