How do I align an image to centre?
It is enough to use the center
enviroment:
\begin{center}
\includegraphics{yourimage}
\end{center}
The third way is to use the figure
environment, which is the best way in my opinion, since it provides the right mark-up. (beamer
centers the figures by default.)
\begin{figure}
\includegraphics{<your image>}
\end{figure}
In this case on may also add a caption with \caption{<text>}
Here are two ways of achieving this:
\begin{center}
\includegraphics{<your image>}
\end{center}
or
\hfill\includegraphics{<your image>}\hspace*{\fill}
The former may add some vertical whitespace, while the latter centers its contents on the line used.