There are a couple of different ways this could be done.

Alpha-blending over top of the image (should work for everything but 
Postscript):

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


Or under the axes as described here:

http://www.mail-archive.com/[EMAIL PROTECTED]/msg06036.html

The fiddly bits are just scaling it in such a way to fit.

Patches welcome... ;)

Cheers,
Mike

Nils Wagner wrote:
> Hi All,
>   
> This is to let you know that I have filed a feature 
> request for a watermark function in mpl.
>
> http://sourceforge.net/tracker/index.php?func=detail&atid=560721&aid=2001940&group_id=80706
>
> 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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