How to insert a background image at the bottom of a beamer frame?

Question

I am using the answer given here i.e.

% Local background must be enclosed by curly braces for grouping.
{
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{kitten.jpg}}%
\begin{frame}{Kitten}
\begin{itemize}
\item 1
\item 2
\item 3
\end{itemize}
\end{frame}
}

I only know how to force an image to be in the bottom by using \begin{figure}[b]\end{figure} but if I use that I receive an error. My attempt looks like this:

% Local background must be enclosed by curly braces for grouping.
{
\usebackgroundtemplate{\begin{figure}[b]\includegraphics[width=\paperwidth]{kitten.jpg}\end{figure}}%
\begin{frame}{Kitten}
\begin{itemize}
\item 1
\item 2
\item 3
\end{itemize}
\end{frame}
}

I would like to find a way of positioning the image of the background at the bottom.

Thank you in advance!

Simon Dispa · Answer 1 · 2021-10-08T19:52:35.187

Add the package tikz and use xshift and yshift to move the image.

There are many other alternatives but this one has a very easy to understand code.

In the first frame the center of the image (A) coincides with the center of the frame, so xshift and yshift are equal to 0cm.

In the second frame the image (B) --with a height of 0.5\paperheight-- is shifted 0.25\paperheight down and touches the bottom.

\documentclass{beamer}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usetheme{default}
\usepackage{tikz} % added <<<<<<<<<<<<<<<<
\usepackage{kantlipsum} % dummy text not needed
\begin{document}

    {\usebackgroundtemplate{%
        \begin{tikzpicture}[remember picture,overlay]
            \node [xshift=0cm,yshift=0cm] at (current page.center){\includegraphics[height=0.5\paperheight, keepaspectratio]{example-image-a}};
        \end{tikzpicture}
                                }%
    \begin{frame}{Center}
        \begin{itemize}
            \item 1
            \item 2
            \item 3
        \end{itemize}
    \end{frame}
}

    {\usebackgroundtemplate{%
        \begin{tikzpicture}[remember picture,overlay]
            \node [xshift=0cm,yshift=-0.25\paperheight] at (current page.center){\includegraphics[height=0.5\paperheight, keepaspectratio]{example-image-b}};
        \end{tikzpicture}
            }%

    \begin{frame}{Bottom}
        \begin{itemize}
            \item 1
            \item 2
            \item 3
        \end{itemize}
    \end{frame}
}

{\usebackgroundtemplate{%
    \begin{tikzpicture}[remember picture,overlay]
        \node [xshift=-0.1\paperheight,yshift= 0.12\paperheight] at (current page.south east){\includegraphics[height=0.16\paperheight, keepaspectratio]{example-grid-100x100pt}};
    \end{tikzpicture}
}%

\begin{frame}{Bottom right}
\kant[9] 
\end{frame}
    }   

\end{document}

Here, the center of a smaller image is set in the lower right corner of the frame, so it needs to be moved to the left and up.

See more examples in Positioning relative to page in TikZ

Finding the desired position would be easier if you add an anchor to the node as well. For example, \node [anchor=south east,inner sep=0] at (current page.south east){\includegraphics[width=0.25\paperheight]{example-image-c}}; — erik, Oct 08 '21 at 19:22
@erik You are right, but I do not know if the OP is familiar with tikz. With movements in units of image height should be enough as a starting point. — Simon Dispa, Oct 08 '21 at 19:33

How to insert a background image at the bottom of a beamer frame?

1 Answers1