    CImg<T>& label(const bool is_high_connectivity=false, const Tfloat tolerance=0,
                   const bool is_L2_norm=true) {
      if (is_empty()) return *this;
      return get_label(is_high_connectivity,tolerance,is_L2_norm).move_to(*this);
    }
    CImg<T>& label(const bool is_high_connectivity=false, const Tfloat tolerance=0,
                   const bool is_L2_norm=true) {
      if (is_empty()) return *this;
      return get_label(is_high_connectivity,tolerance,is_L2_norm).move_to(*this);
    }