How to insert a background image in a beamer frame?

Question

I want to insert a background image in a beamer frame and use this "frame" as a beamer frame. I want to insert different background images on different frames. Towards this end, I tried

\usebackgroundtemplate{\includegraphics[width=\paperwidth]{../images/crayons.png}}

on a specific frame to insert a background image, but I was unsuccessful. Am I missing any package? Or is there a different way of doing this?

I found this question here about inserting image but not as a background. In addition to inserting a background image, I also want to add text to the frame. (It is highly likely that I could not understand the questions correctly)

As a side note, if any of you are an Emacs org-mode users, can you please tell me a way to do this in org-beamer. I will be very thankful.

Here is a sample slide code:

\documentclass[bigger]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fixltx2e}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{float}
\usepackage{wrapfig}
\usepackage{soul}
\usepackage{textcomp}
\usepackage{marvosym}
\usepackage{wasysym}
\usepackage{latexsym}
\usepackage{amssymb}
\usepackage{hyperref}
\begin{frame} \frametitle{Models}
\label{sec-2_3}
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{../images/crayons.png}}
\begin{itemize} 
\item choose training data set
\item choose test data set
\item choose model
\item fit on training data set
\end{itemize}
\end{frame}

Answer 1

I used images Sir Isaac Newton (rename it as newton.jpg) and Kitten (rename it as kitten.jpg)

The code snippet below is self-explanatory and I compiled using pdflatex.exe because of .jpg format.

\documentclass[bigger]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{graphicx}


%Global Background must be put in preamble
\usebackgroundtemplate%
{%
    \includegraphics[width=\paperwidth,height=\paperheight]{newton.jpg}%
}




\begin{document}

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


% 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}
}

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

\end{document}

Answer 2

Write \usebackgroundtemplate before the frame, not within:

\end{frame}
% Now we install the new template for the following frames:
{\usebackgroundtemplate{%
  \includegraphics[width=\paperwidth,height=\paperheight]{crayons}} 
\begin{frame}
...
\end{frame}}
% Now we install another template, effective from now on:
\usebackgroundtemplate{...}

Ensure that \includegraphics is able to find the image file, since you used ../images/crayons.png.

Edit: The \usebackgroundtemplate should be enclosed with curly braces along with frame (or frames) which it should affect

Answer 3

\documentclass{beamer}
\usetheme{metropolis}
\begin{document}
{
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{example-image-a}}
\begin{frame}{Title}
Content
\end{frame}
}
\begin{frame}{Title}
Content
\end{frame}
\end{document}