如何在 mdframed 中插入背景图像

Question

按照此答案 (小页面背景图片) 我在显示背景图像时遇到问题，下面的示例没有显示任何图像痕迹，我该如何修复它。

\documentclass{article} 
\usepackage{graphicx,tikz}
\usepackage{lipsum}
\usepackage[style=0]{mdframed}
\makeatletter

\newrobustcmd*\mdf@backgroundimage{%
    \rlap{\hspace*{0.5\mdfboundingboxwidth}%
        \makebox[0pt][c]{%
            \tikz[remember picture]%
            \node (0,0) [opacity=0.4] {%
                \includegraphics[width=\mdfboundingboxwidth,%
                height=\mdfboundingboxheight,%
                keepaspectratio]%
                {example-image}%
            };
        }%
    }%
}

    \appto\md@frame@background@single\mdf@backgroundimage%
    \appto\md@frame@background@first\mdf@backgroundimage%
    \appto\md@frame@background@middle\mdf@backgroundimage%
    \appto\md@frame@background@second\mdf@backgroundimage%

\makeatother
\begin{document}

    Some text before

    \begin{mdframed} 
        \lipsum[1-2]
    \end{mdframed}

    Some text behind    

\end{document}

Answer 1

控制台输出清楚地描述了问题并提出了解决方案。这些信息也将在您的.log文件中。这就是此输出的内容。为了：告诉你有用的东西！

Package mdframed Warning: package option style is depreciated
 at this point and will be ignored
 use framemethod instead
(mdframed)                 on input line 382.

这告诉您一些重要信息：该包已更改，您的请求已被忽略。它还向您指出了等效功能。

快速浏览文档中的示例可以获得更成功的结果，因此如果您的猫因为您没有阅读手册而离开家，请不要责怪它的作者。

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage[framemethod=tikz]{mdframed}
\usetikzlibrary{backgrounds}
\mdfdefinestyle{mystyle}{%
  apptotikzsetting={%
    \tikzset{mdfbackground/.style={},}
  },
  singleextra={%
    \scoped[on background layer]{\node [xshift=.5*\mdfboundingboxwidth, yshift=.5*\mdfboundingboxheight, opacity=.4] {\includegraphics[width=\mdfboundingboxwidth, height=\mdfboundingboxheight, keepaspectratio]{cath-gadael-chartref}};}
  },
}
\begin{document}
Some text before

\begin{mdframed}[style=mystyle]
  \lipsum[1-2]
\end{mdframed}

Some text behind
\end{document}

Answer 2

我会放弃 mdframed。使用 tcolorbox 插入这样的背景图像要容易得多：

\documentclass{article}
\usepackage{graphicx,tikz}
\usepackage{lipsum}
\usepackage[many]{tcolorbox}

\begin{document}

    Some text before

\begin{tcolorbox}[enhanced,
                 watermark graphics=example-image-a,
                 watermark stretch=1.00]]
\lipsum[1-2]

\end{tcolorbox}

Some text behind

\end{document}