# Figures much clearer in the internal PDF-Viewer

I have a problem:

In my thesis I added some figures via:

\begin{figure}[H]
\begin{center}
\includegraphics[width=\textwidth]{figure.png}
\caption{blablabla}
\label{Abb.1}
\end{center}
\end{figure}


My problem is, that the internal PDF-Viewer (I use TexMaker V4.1.1 under Debian Wheezy x64) displays the figures much, much clearer than any external PDF-Viewer.. But I am opening the same (!) file.

The following link shows a screenshot. On the left side one can see the internal Viewer from TexMaker and on the right side my external. http://i.imgur.com/Apia4fx.png