making included graphics larger

I'm trying to include some graphics into my report, and I can't find the normal width which can take an image to respect the margin-left and the margin-right of a page.

Here is the code that I've tried :

\begin{figure}[H]
\hfill{}\includegraphics[scale=0.8]{images/seq_auth}\hfill{}
\caption{abc}
\label{fg:seq_auth}
\end{figure}


But, the font of the text that is part of the graphic is too small to see when I've printed it. So, I thought that I maybe need to make it as wide as possible.

-
\includegraphics[width=\linewidth]{images/seq_auth} only. Remove both \hfill{} and use \centering inside the figure environment. – Sigur Jan 24 '14 at 18:08
See this related question. – Fran Jan 24 '14 at 18:31

\documentclass{report}
\usepackage{lipsum} % dummy text
\usepackage{graphicx}
\begin{document}

\lipsum*[1]
\begin{figure}[h]\centering
\includegraphics[width=\linewidth]{images/seq_auth}
\caption{abc}
\label{fg:seq_auth}
\end{figure}
\lipsum*[2]
\end{document}


-
Or even \includegraphics[width=0.8\linewidth]{...} or such. – vonbrand Jan 24 '14 at 18:20
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