Re: [Matplotlib-users] [Matplotlib-announce] Saving image in .jpeg format

[Michael Droettboom]

The matplotlib-announce list is for announcements about releases of 
matplotlib and related projects only.  Please ask user questions on 
matplotlib-users.  (I have forwarded this message there).

There is a table of which output formats are supported by each backend here:

http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/FILETYPES?revision=3801&view=markup

GtkAgg should be your best bet, but due to its reliance on Gtk, it can't 
be run on a headless server.  If you need to run in such a mode (such as 
on a webserver), your best bet is probably to use Agg, save to png, and 
use PIL or ImageMagick etc. to convert afterward.

Mike

Emanuele Passera wrote:
> Hi all,
> I have always used .png format for my matplotlib applications but now i am 
> compelled to save many figures in .jpeg format.
> Those image should be automatically saved (no GUI) but i can't find out how 
> to 
> save the images.
>
> Executing this scripts 
>
> import pylab as p
> p.rcParams['backend']='gdk'
> p.figure(1)
> p.plot([1,2,3,4,5,6],[3,7,5,4,6,3])
> p.savefig("example.jpg")
>
> It gives me this error
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/site-packages/matplotlib/pyplot.py", line 345, in 
> savefig
>     return fig.savefig(*args, **kwargs)
>   File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 990, in 
> savefig
>     self.canvas.print_figure(*args, **kwargs)
>   File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line 
> 1373, in print_figure
>     '%s.' % (format, ', '.join(formats)))
> ValueError: Format "jpg" is not supported.
> Supported formats: emf, eps, pdf, png, ps, raw, rgba, svg, svgz.
>
> Can anyone help me ? (.jpeg extension it doesn't work too)
> By the way, what is the best backend to fulfill the task ? (better quality 
> and 
> less memory leackage ?)
>   

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA


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