add_filter('nectar_activate_transparent_header','salient_child_modify_transparent_nav');

function salient_child_modify_transparent_nav($bool) {
  if (is_singular('post')) {
      return true;
  }

  // Check if it's an archive for the specified post type
  if (is_post_type_archive('post')) {
      return true;
  }
    return $bool;

}