% FULL-PAGE A4 FRONT COVER (no floats, no eso-pic)
\clearpage
\begin{titlepage}
  \newgeometry{left=0cm,right=0cm,top=0cm,bottom=0cm} % zero margins
  \thispagestyle{empty}

  % Centered and stretched to exactly fill A4
  \noindent\makebox[\paperwidth][c]{%
    \includegraphics[width=\paperwidth,height=\paperheight]{images/coverimage1.png}%
  }

  \restoregeometry
\end{titlepage}
