beamertextpos
I am using the textpos package to position images on beamer slides. My problem is that I would like to have these images in some slides in the front of everything else (package option "overlay") and in others behind the lower bar in the beamer presentation.
Is it possible to change the package option in the document?
Question 1: You can use any of the fields given by \author, \title, \date, or \institute to place the image in the title page; if none of those fields allow you to achieve the desired placement, you can use the textpos package. The example below uses the \author field to add the image.
Question 2: With the help of the textpos package you can add the logo to the frametitle template using \addtobeamertemplate.
A simple example code:
\documentclass{beamer}
\usetheme{Madrid}
\usecolortheme{beaver}
\usepackage{textpos}
\title{The title}
\author[The author]{\includegraphics[height=1cm,width=2cm]{cat}\\The Author}
\institute[Inst.]{The Institute}
\date{\today}
\begin{document}
\begin{frame}
\maketitle
\end{frame}
\addtobeamertemplate{frametitle}{}{%
\begin{textblock*}{100mm}(.85\textwidth,-1cm)
\includegraphics[height=1cm,width=2cm]{cat}
\end{textblock*}}
\begin{frame}{Motivation}
Now the logo is visible
\end{frame}
\end{document}
As osjerick mentions in a comment, the above solution won't behave correctly if \framesubtitle is used (the image will shift downwards); in this case, a TikZ approach can be used to prevent the movement:
\documentclass{beamer}
\usetheme{Madrid}
\usecolortheme{beaver}
\usepackage{tikz}
\title{The title}
\author[The author]{\includegraphics[height=1cm,width=2cm]{cat}\\The Author}
\institute[Inst.]{The Institute}
\date{\today}
\begin{document}
\begin{frame}
\maketitle
\end{frame}
\addtobeamertemplate{frametitle}{}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north east,yshift=2pt] at (current page.north east) {\includegraphics[height=0.8cm]{cat}};
\end{tikzpicture}}
\begin{frame}{Motivation}
Now the logo is visible
\end{frame}
\begin{frame}{Motivation}
\framesubtitle{A}
Now the logo is visible
\end{frame}
\end{document}
A wrapper class beamer16x9.cls can be easily written:
\ProvidesClass{beamer16x9}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{beamer}}
\ProcessOptions\relax
\LoadClass[aspectratio=169]{beamer}
\endinput
Then starting a document with
\documentclass[<options>]{beamer16x9}
is equivalent to saying
\documentclass[aspectratio=169,<options>]{beamer}
The beamer16x9.cls file should be in one of the canonical places where TeX engines look for input.
Best Answer
This functionality should appear in textpos v1.8. That's not yet released, because I haven't yet had the time to tidy up the docs, but until it is released and included in distributions, you can have a try with v1.8b1. Any problems, do shout.