Hi Jouni,
Am 06.09.2011 18:10, schrieb Jouni K. Seppänen:
> Frank Breitling<fbreitl...@aip.de> writes:
>
>> I am using the GTKAgg backend which was the only one I found with
>> support for JPEG.
> I think that backend inherits its support from the GTK backend, which
> uses GDK for saving JPEG files, and doesn't do anything with those
> options.
>
> I just realized that the Agg support depends on PIL. If you have that
> installed, this script should produce a really low-quality JPEG file:
>
> ----------------------------------------------------------------------
> #!/usr/bin/env python
> import matplotlib
> matplotlib.use('agg')
> import pylab
>
> pylab.plot([3,1,4,1,5,9,2], lw=4)
> pylab.savefig('foo.jpeg', quality=1)
> ----------------------------------------------------------------------
I have the PIL module installed on my system (if this is what you mean)
but when I run your example I see
lfe001:~$ jpg.py
Traceback (most recent call last):
File "./jpg.py", line 7, in <module>
pylab.savefig('foo.jpeg', quality=1)
File
"/data/sys/opt/pythonlibs/lib/python2.5/site-packages/matplotlib/pyplot.py",
line 356, in savefig
return fig.savefig(*args, **kwargs)
File
"/data/sys/opt/pythonlibs/lib/python2.5/site-packages/matplotlib/figure.py",
line 1032, in savefig
self.canvas.print_figure(*args, **kwargs)
File
"/data/sys/opt/pythonlibs/lib/python2.5/site-packages/matplotlib/backend_bases.py",
line 1420, in print_figure
'%s.' % (format, ', '.join(formats)))
ValueError: Format "jpeg" is not supported.
Supported formats: emf, eps, pdf, png, ps, raw, rgba, svg, svgz.
> If you do have PIL, you could use the non-interactive agg backend. If
> you do need to use an interactive backend that doesn't have support
> for these options, you could look at the implementation of
> FigureCanvasBase.print_jpg and replicate its functionality.
Sounds complicated. I don't know how to do that.
>> Besides, it would be very useful to find these options in the
>> documentation or the help if there is a situation in which they work.
> The options are documented, but it's not very easy to find them:
>
> http://matplotlib.sourceforge.net/api/backend_bases_api.html#matplotlib.backend_bases.FigureCanvasBase.print_jpeg
>
Well, I think it should also be listed at
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.savefig
.
Frank
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