%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-01-16 on page 21.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks}
\newcount\WL \unitlength.75pt
\def\WaveToPS#1{%
  \definecolor{tmp}{wave}{#1}\extractcolorspec{tmp}\tmp
  \expandafter\convertcolorspec\tmp{rgb}\tmp \expandafter\WaveToPSi\tmp,}
\def\WaveToPSi#1,#2,#3,{\pstVerb{/Red {#1} def /Green {#2} def /Blue {#3} def}}
%
\pstVerb{/Corr {dup 0 gt {Gamma exp} if } def }
\definecolor[ps]{lambda}{rgb}{Red Corr Green Corr Blue Corr}

\begin{document}
\begin{picture}(510,70)(310,-10)\sffamily\tiny
  \linethickness{1.25\unitlength}\WL=360
  \pstVerb{/Gamma .8 def}\multiput(320,0)(1,0){456}{%
    \WaveToPS{\the\WL}{\color{lambda}\line(0,1){50}}\global\advance\WL1}%
  \linethickness{0.25\unitlength}\WL=360
  \multiput(320,0)(20,0){23}{%
    \picture(0,0)
      \line(0,-1){5}\multiput(5,0)(5,0){3}{\line(0,-1){2.5}}%
      \put(0,-10){\makebox(0,0){\the\WL}}\global\advance\WL20
    \endpicture}%
\end{picture}
\end{document}
