Florent Georges wrote:
  This question is maybe a little bit off-topic.  I have a
problem with a grey background while faxing a printed PDF,
generated by FOP.  The background looks like in the
following (in French, I think we say it is an "effet de
moiré"):

    http://www.fgeorges.org/tmp/fax-bug.png

  For a sample of original document:

    http://www.fgeorges.org/tmp/fax-bug-sample.png

  Does someone knows a trick we could use (a different
color, or whatever)?  Or have we to just drop the grey
color, and use a plain white background?

Try a higher resolution printer (or printer setting) first,
or even just another, modern printer.
Small changes in the grey value may also have an effect.
If you can get detailed information on your printer (resolution,
dithering algorithm/matrix, or how certain grey values are
represented), you can try to generate a specifically adjusted
background bitmap image.
Just slightly tilting the paper in the fax is another option.

Of course, the simplest solution is to use a white background.

J.Pietschmann

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