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

\parindent0pt

\usepackage{pstricks}

\definecolor{frenchRed}{HTML}{EF4531}
\definecolor{frenchBlue}{HTML}{0055A4}

\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(15,10)
%% Flagge (Verh\"{a}ltnis 3 Breite : 2 H\"{o}he)
\psframe[linecolor=frenchBlue,fillstyle=solid,fillcolor=frenchBlue](0,0)(5,10)
\psframe[linecolor=white,fillstyle=solid,fillcolor=white](5,0)(10,10)
\psframe[linecolor=frenchRed,fillstyle=solid,fillcolor=frenchRed](10,0)(15,10)

\end{pspicture}
\end{document}
