\mode<presentation>

\RequirePackage{tikz}

\defbeamertemplate*{title page}{tvstud}[1][]
{
  \vbox{}
  \vfill
  \begingroup
    \centering
    \tikz[overlay,remember picture] \node[opacity=0.7, at=(current page.center)] {
       \includegraphics[height=0.88\paperheight,width=0.92\paperwidth]{hintergrund.jpg}
    };
    \begin{beamercolorbox}[sep=8pt,center,#1]{white}
      \begin{beamercolorbox}[sep=8pt,center,#1]{title}
        \usebeamerfont{title}\inserttitle\par%
        \ifx\insertsubtitle\@empty%
        \else%
          \vskip0.25em%
          {\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
        \fi%     
      \end{beamercolorbox}%
      \vskip1em\par
      \begin{beamercolorbox}[sep=8pt,center,#1]{author}
        \usebeamerfont{author}\insertauthor
      \end{beamercolorbox}
      \begin{beamercolorbox}[sep=8pt,center,#1]{institute}
        \usebeamerfont{institute}\insertinstitute
      \end{beamercolorbox}
      \begin{beamercolorbox}[sep=8pt,center,#1]{date}
        \usebeamerfont{date}\insertdate
      \end{beamercolorbox}\vskip0.5em
      {\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
    \end{beamercolorbox}
  \endgroup
  \vfill
}

\mode<all>
\endinput