Community-Lab introduction

Artifact 5b9e0324a009d8cf87aed8bd4bf21144796d07c4:

• File slides-header.tex — part of check-in [79f59fb314] at 2014-01-29 14:34:40 on branch fosdem-2014 — Rename ``pngs`` to ``imgs``, use PDF for background. (user: ivan, size: 440) [annotate] [blame] [check-ins using]

%% https://tex.stackexchange.com/questions/26458/beamer-background-image-centered
%% https://tex.stackexchange.com/questions/74038/transparent-image-background-in-beamer
\usepackage{tikz}
\usebackgroundtemplate {
  \vbox to \paperheight {
    \vfil
    \hbox to \paperwidth {
      \hfil
      \tikz\node[opacity=0.25] {
        \includegraphics[width=0.75\textwidth]{imgs/confine,background.pdf}
      };
      \hfil
    }
    \vfil
  }
}