You could add some semi-transparent text across the figure with 
something like:

gcf().text(0.1, 0.1, "Watermark", rotation=45, 
fontproperties=FontProperties(size=64), alpha=0.2)

Unfortunately, alpha-transparency on text is not supported in the Agg 
and Svg backends (more due to an oversight than it being terribly 
difficult to implement -- I can try to get this in for the 0.91.2 
release).  But it does work on Pdf and Cairo.  (Supporting it in Ps will 
be quite difficult).

There may also be external tools to do this *after* generating the plot 
from matplotlib, e.g.:

http://www.selonen.org/arto/netbsd/watermarks.html

Cheers,
Mike

Nils Wagner wrote:
> Hi all,
> 
> Is it possible to add a water mark to a plot ?
> 
> Nils
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

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