peekColor(const PMatrix<T,N,C>& l, int row, int col)
peekColor(const PMatrix<T,N,C>& l, int row)
peekColor(const PMatrix<T,N,C>& l, int row, int col){  typename UnaryReturn<PMatrix<T,N,C>, FnPeekColorMatrix>::Type_t  d;  for(int i=0; i < N; ++i)    for(int j=0; j < N; ++j)      d.elem(i,j) = peekColor(l.elem(i,j),row,col);  return d;}