\listfiles
\documentclass{article}
\usepackage{pstricks,multido}

\definecolorseries{testA}{rgb}{last}{blue}{yellow}
\resetcolorseries[300]{testA}%  defines the series with 200 colors
\definecolorseries{testC}{cmyk}{last}{white}[cmyk]{1,0,0,0}
\resetcolorseries[11]{testC}%  cyan series with 10 colors
\definecolorseries{testM}{cmyk}{last}{white}[cmyk]{0,1,0,0}
\resetcolorseries[11]{testM}%  magenta series with 10 colors
\definecolorseries{testY}{cmyk}{last}{white}[cmyk]{0,0,1,0}
\resetcolorseries[11]{testY}%  yellow series with 10 colors
\definecolorseries{testK}{cmyk}{last}{white}[cmyk]{0,0,0,1}
\resetcolorseries[11]{testK}%  black series with 10 colors

\parindent=0pt
\pagestyle{empty}

\begin{document}

\psset{unit=1bp,linewidth=1.2pt}
\begin{pspicture}(300,50)
  \multido{\nC=1+1}{300}{%
    \psline[linecolor={testA!![\nC]}](\nC,0)(\nC,50)}
\end{pspicture}

\clearpage
\vspace{5mm}
\setlength{\fboxsep}{2mm}
\makebox[20mm][l]{cyan (C):}%
\multido{\nColr=0+1}{10}{\colorbox{testC!![\nColr]}{.\nColr}}\colorbox{testC!![10]}{1}\\
\makebox[20mm][l]{magenta (M):}%
\multido{\nColr=0+1}{10}{\colorbox{testM!![\nColr]}{.\nColr}}\colorbox{testM!![10]}{1}\\
\makebox[20mm][l]{yellow (Y):}%
\multido{\nColr=0+1}{10}{\colorbox{testY!![\nColr]}{.\nColr}}\colorbox{testY!![10]}{1}\\
\makebox[20mm][l]{black (K):}%
\multido{\nColr=0+1}{10}{\colorbox{testK!![\nColr]}{.\nColr}}\colorbox{testK!![10]}{1}

    
\end{document}
