Image is surrounded by a red glowing halo

[alci mecadu org]

Hi,

I am generating pdf reports using JasperReports (that in turn uses
iText). Both tools are FOSS written in java.

If I include graphs in these reports and view them in evince, I get a
red "halo" around them...
If viewed in Acrobat Reader, they look perfectly clean.

[I join an example file to this mail. - I DONT, my post is blocked if I do]

Is this a known problem ?
What other information should I give to sort this out ?

Regards,
Franck