LaTeX beamer：在前景中获取图片

Question

我正在尝试为海报框架编写一些样式文件，以供我们使用。标题几乎已准备就绪：

\setbeamertemplate{headline}
{
\begin{beamercolorbox}[ht=15cm]{headline}
\begin{tikzpicture}[overlay, remember picture]
    %title text
    \node [anchor=north west,inner sep=0pt,text width=60cm] at ($(current page.north west)+(4.5cm,-2.8cm)$)
        {
        {\usebeamerfont{title}\usebeamercolor{headline}\color{fg}\inserttitle\par}%
        \ifx\insertsubtitle\@empty%
        \else%
            \vskip28mm\par%
            {\usebeamerfont{subtitle}\usebeamercolor{headline}\color{fg}\insertsubtitle\par}%
        \fi%
        %{\usebeamerfont{subtitle}\usebeamercolor{headline}\color{fg}\insertauthor\par}%
        %   {\usebeamerfont{institute}\usebeamercolor{headline}\color{fg}\insertinstitute\par}              
        };
    %hzdr logo
    \node [anchor=north east,inner sep=0pt] at ($(current page.north east)-(2cm,2.8cm)$)
        {\includegraphics[width=22.39cm,hiresbb]{HIF_E_weiss_auf_transparent}};
    %
    \node [anchor=north east, inner sep=0pt] at ($(current page.north east)-(-3cm,13cm)$)
        {\includegraphics[hiresbb]{PIKTO_ENGL_300DPI21}};
\end{tikzpicture}
\end{beamercolorbox}
}

最后一张图超出了实际的标题。它应该是可见的，也就是说，无论在海报的标题下添加什么，它都应该留在前景中。海报主要由其他 beamercolorbox 组成：

\newcommand\posterblock[4][]
{
    \fcolorbox{hzdr-blue}{white}{
        \begin{beamercolorbox}[colsep*=1ex,#1]{bgblock}%use bigger values for colsep* if you want to make the box around the text bigger;warning: if you use the option rounded this will disable the horizontal spaces around the text
            \begin{block}{\usebeamerfont{block title}#2}\justify
                {\usebeamerfont{small block title}\color{hzdr-blue}{#3}}\vspace{2ex}

                {\usebeamerfont{block body}#4}
            \end{block}
        \end{beamercolorbox}}
        \quad
}

但是当我使用这个海报块时，它总是在图片上方。有人能帮忙让图片保持在前景吗？

Answer 1

要使图片始终留在背景中，请使用命令

\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\paperheight]{your_picture_file}}

您可以调整width和height参数以满足您的需要。