[pstricks] opacity for external graphics

[Marco Daniel]

Hello,

the following example describe my problem.

\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{pstricks-add}
\begin{document}
\begin{center}
\begin{tikzpicture}%
             \node (0,0) {\bfseries\Large HALLO};%
             \node  [opacity=0.2]{\includegraphics[width=5cm]{tiger}};%
  \end{tikzpicture}
  \end{center}

\begin{center}
  \begin{pspicture}[linewidth=1cm](-4,-4)(4,4)
       \rput(0,0){\bfseries\Large HALLO}
       \rput(0,0){\includegraphics[width=5cm]{tiger}}
   \end{pspicture}
  \end{center}
\end{document}

In the tikz-environment it is possible to influence the graphic by the 
parameter opacity. Now I want to get the same result with pstricks. Is 
it possible?

I used the tiger.eps of the LaTeX-Distribution.

regards
Marco