%%
%% To make a cover page, put an image covering the whole page
%%
\newdimen\cover@voff
\newdimen\cover@hoff

\def\putoncover#1{%
  \newpage\thispagestyle{empty}%
  \sbox{\z@}{#1}%
  % Compute the top left position of the page from current location
  \setlength{\cover@voff}{-\voffset-\headheight-\headsep-\topmargin-\topskip-1in}%
  \setlength{\cover@hoff}{\hoffset+1in}%
  \ifodd\c@page%
    \advance\cover@hoff\oddsidemargin%
  \else%
    \advance\cover@hoff\evensidemargin%
  \fi%
  \setlength{\unitlength}{1pt}% In the case it has been changed
  \noindent\begin{picture}(0,0)(\strip@pt\cover@hoff,\strip@pt\cover@voff)
  \put(0,-\strip@pt\paperheight){%
    \makebox(\strip@pt\paperwidth,\strip@pt\paperheight){\usebox{\z@}}}
  \end{picture}%
}

\def\putcovergraphic#1{%
  \putoncover{\includegraphics[width=\paperwidth,
                               height=\paperheight,
                               keepaspectratio=true]{#1}}%
}