plotting to gif ?

[robert]

What is a good library for plotting graphs to (compressed) gif / jpg 
images?
Has anybody experience with this?

I want to  put some simple 2D (and maybe 3D) graph data visualization on 
a web server. Currently I test-output the data through Gnuplot.py & 
Gnuplot.

I'm quite confused about 
http://wiki.python.org/moin/NumericAndScientific/Plotting which would 
leave me trying out almost everything.

I'd need/like:

* simple usage (not requesting too many other frameworks/libs installed 
extra)
* displaying many curves in parallel / 2 y-achses scaling independently.
* compressed gif's/png/jpg as the images are big but mostly white and going


robert