\documentclass{article}
\usepackage{web}
\margins{0pt}{0pt}{0pt}{0pt}   %% Kein Seitenrand
\screensize{100mm}{150mm}      %% Dimensionen: H\"{o}he, Breite des Dokuments

\parindent0pt

\usepackage{pstricks,pstricks-add}

\definecolor{netherlandsRed}{HTML}{AE1C28}
\definecolor{netherlandsBlue}{HTML}{21468B}

\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(15,10)
%% Flagge (Verh\"{a}ltnis 3 Breite : 2 H\"{o}he)
\psframe[linecolor=netherlandsRed,fillstyle=solid,fillcolor=netherlandsRed](!0 10 3 div 2 mul)(15,10)
\psframe[linecolor=white,fillstyle=solid,fillcolor=white](!0 10 3 div)(!15 10 3 div 2 mul)
\psframe[linecolor=netherlandsBlue,fillstyle=solid,fillcolor=netherlandsBlue](0,0)(!15 10 3 div)

\end{pspicture}
\end{document}
