[Tex/LaTex] How to make a background picture transparent

Question

I used the wallpaper package to add a background picture to a document site. My code:

\documentclass{scrartcl}
\usepackage{wallpaper}
\begin{document}
  \ThisTileWallPaper{\paperwidth}{\paperheight}{hands}
  \Huge Text!
\end{document}

I wish to make it transparent so the result looks like this. I mean the transparent package with the command {\transparent{0.4}}. How can I do it? Here's the picture:

Answer 1

One can also use TikZ. Be sure to run it twice.

\documentclass{scrartcl}
\usepackage{tikz}
\begin{document}
  \begin{tikzpicture}[remember picture, overlay]
  \node[opacity=0.6,inner sep=0pt] at (current page.center)
   {\includegraphics[width=\paperwidth,height=\paperheight]{example-image}};
  \end{tikzpicture}
  \Huge Text!
\end{document}