% -*- coding : utf8 -*-
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage{lmodern}

\usepackage{graphicx}

%%%%
%  For externalimage :
% specials.sty and supp-mpe_mod.tex 
% must be in the path
\usepackage{specials}
\LoadMetaPostSpecialExtensions
%%%%

\begin{document}

  \includegraphics[width=3cm]{image1}
  \includegraphics[width=3cm]{image2}
  \includegraphics[width=3cm]{image3}
  \includegraphics[width=3cm]{image4}\\
 \includegraphics{image1}
 \includegraphics{image2}
 \includegraphics{image3}
 \includegraphics{image4}\\

  \includegraphics[width=3cm]{image_ro1}
  \includegraphics[width=3cm]{image_ro2}
  \includegraphics[width=3cm]{image_ro3}
  \includegraphics[width=3cm]{image_ro4}\\
 \includegraphics{image_ro1}
 \includegraphics{image_ro2}
 \includegraphics{image_ro3}
 \includegraphics{image_ro4}\\

\end{document}
