public function filterByPhotographer($photographer = null, $comparison = null)
    {
        if (null === $comparison) {
            if (is_array($photographer)) {
                $comparison = Criteria::IN;
            } elseif (preg_match('/[\%\*]/', $photographer)) {
                $photographer = str_replace('*', '%', $photographer);
                $comparison = Criteria::LIKE;
            }
        }

        return $this->addUsingAlias(PictureTableMap::COL_PHOTOGRAPHER, $photographer, $comparison);
    }