strange image scaling

Hello list,

In my new docbook document (PDF output with FO), I use some graphic.

<figure>
    <title>My title</title>
    <graphic fileref="images/Chapter1/myImages.jpg"/>
</figure>

It's simple but I have a strange problem.

My image are scaled to the page larger. I try to use scalefit="0" but
the image still resizing.

What can I do to have the right size of my original picture without give
all pictures sizes ?

Thanks in advance,
Jacques
-- 
PHYSIQUE QUANTIQUE : c'est un homme aveugle, dans une pi鋃e sombre, qui cherche un chat noir. Qui n'existe pas.
               P. Desproges