    CImg<T>& operator%=(const char *const expression) {
      return *this%=(+*this)._fill(expression,true,1,0,0,"operator%=",this);
    }
    CImg<T>& operator%=(const char *const expression) {
      return *this%=(+*this)._fill(expression,true,1,0,0,"operator%=",this);
    }