[XeTeX] Scaling graphics

[José Carlos Santos]

Hi all,

If I compile this file:

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[scale=.4]{Figura_3-1.jpg}
\end{document}

with PDFLaTeX, then all goes well. But if I use XeLaTeX instead, then
I get this:

<use  "Figura_3-1.jpg" >
Overfull \hbox (427.1866pt too wide) in paragraph at lines 4--5
[][]

Can anyone tell me why?

Best regards,

Jose Carlos Santos