如何在投影仪中的图形右下角添加源信息？

Question

我正在向演示文稿中插入一些beamer我自己没有创建的图片。因此，我想仅使用命令添加一些源信息，例如

\PassOptionsToPackage{demo}{graphicx}
\documentclass[12pt]{beamer}

\newcommand{\credit}[1]{what to put here?}

\begin{document}
\begin{frame}{demo}
\includegraphics[width=\linewidth]{demo}
\credit{Credit where credit is due.} % How best to implement this?
\end{frame}
\end{document}

它应该看起来是这样的，但理想情况下字体看起来不会那么笨重。

Answer 1

\PassOptionsToPackage{demo}{graphicx}
\documentclass[12pt]{beamer}

\newcommand{\credit}[1]{\par\hfill \footnotesize Credit:~\itshape#1}

\begin{document}
\begin{frame}{demo}
\includegraphics[width=\linewidth]{demo}
\credit{where credit is due.} % How best to implement this?
\end{frame}
\end{document}

Answer 2

\PassOptionsToPackage{demo}{graphicx}
\documentclass[12pt]{beamer}
\usepackage{tikz}
\usetikzlibrary{calc}
\tikzset{credit/.style={
  append after command={
    let \p1=($(\tikzlastnode.north east)-(\tikzlastnode.north west)$) in
      node[anchor=north east,align=right,text width=\x1,font=\footnotesize,
           node contents={Source:~\textit{#1}}, at = (\tikzlastnode.south east)]
    }
  }
}
\def\myimage#1#2#3{\tikz\node[inner sep=0,credit={#3}]{\includegraphics[#1]{#2}};}

\begin{document}
\begin{frame}{demo}

\myimage{height=2cm}{demo}{where credit is due.}
\myimage{height=1cm,width=4cm}{demo}{Some longer test for testing and more words lack of imagination}

\myimage{height=2cm,width=\textwidth}{demo}{You get the idea}
\end{frame}
\end{document}