將徽標置於幻燈片內容的前面

Question

如何保持徽標在文字和圖像的字體中，我不希望徽標被大圖像隱藏。

  \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

您可以濫用文字圖層上方的其他圖層，例如腳線：

\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}