将徽标放在幻灯片内容的前面

Question

如何让徽标保留在文本和图像的字体中，我不希望徽标被大图像隐藏。

  \documentclass{beamer}
\usetheme{Warsaw}
\usepackage{tikz}
\title{Logo}
\author{Al}
\date{\today}
\setbeamertemplate{footline}{%
  \begin{tikzpicture}[overlay,remember picture]
    \node[opacity=.5,inner sep=0.3cm,anchor=south east, xshift=\paperwidth]  {\includegraphics[scale=0.1]{example-image-c}}; 
  \end{tikzpicture}
}

\setbeamercolor{background canvas}{bg=red}

\begin{document}
\begin{frame}
    \titlepage
\end{frame} 
    
\begin{frame}
\includegraphics{example-image}
\end{frame}
\end{document} 

Answer 1

您可以滥用文本层上方的其他层，例如脚注：

\documentclass{beamer}

\usepackage{tikz}

\setbeamertemplate{footline}{%
  \begin{tikzpicture}[overlay,remember picture]
    \node[opacity=.5,inner sep=0.3cm,anchor=south east, xshift=\paperwidth]  {\includegraphics[scale=0.1]{example-image-c}}; 
  \end{tikzpicture}
}

\setbeamercolor{background canvas}{bg=red}

\begin{document}
\begin{frame}
\includegraphics{example-image}
\end{frame}
\end{document}