# Changing margin for a part of page only

I would like to change the margin for an image only, I've used

\newgeometry{left=0.5cm,bottom=0.1cm,right=0.5cm}
\restoregeometry

But it affects an entire page

for local extension of text width for one equation or image you can use changepage package and his macro adjustwidth:

% preamble ...
\usepackage[sctrict]{changepage}
% ...

\begin{figure}
\includegraphics[width=\linewidth]{Organigramme.png}