Goyo wrote:
> I can't make much sense of this. You don't plot anything and don't use
> canvas.
>
> This code works:
>
> import matplotlib
> matplotlib.use('GTKAgg')
> from matplotlib import pyplot
> pyplot.plot([0, 1, 2, 3], [0, 1, 2, 3])
> fig = pyplot.gcf()
> fig.savefig('test.jpg')
fig.savefig('test.jpg', dpi=150) # or whatever dpi you want
If you are only using savefig, not plotting to the screen, then you
might as well use the agg backend, not the gtkagg.
Eric
>
> But I don't know how to set the dpi value this way. I tried to use the
> OO API but no success.
>
> Goyo
>
> El dom, 12-10-2008 a las 23:45 +0200, Jesper Larsen escribió:
>> Hi matplotlib-users,
>>
>> I decided to try to make some plots that I have previously made in png
>> format using the Agg backend in jpeg format using the GTKAgg backend
>> (which I guess is the one I should use for this). Unfortunately my
>> script exits with an error. I have therefore created a simple test
>> script (test.py) that illustrates the problem (at least on my
>> computer):
>>
>> import matplotlib
>> from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as
>> FigureCanvas
>>
>> fig = matplotlib.figure.Figure(dpi=100)
>> canvas = FigureCanvas(fig)
>> fig.savefig('test.jpg')
>>
>> When I run it I get:
>>
>> $ python test.py
>> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py:357:
>> GtkWarning: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED
>> (widget) || GTK_IS_INVISIBLE (widget)' failed
>> gtk.DrawingArea.realize(self)
>> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py:360:
>> GtkWarning: gdk_pixmap_new: assertion `(drawable != NULL) || (depth !=
>> -1)' failed
>> pixmap = gdk.Pixmap (self.window, width, height)
>> Traceback (most recent call last):
>> File "test.py", line 6, in <module>
>> fig.savefig('test.jpg')
>> File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
>> 964, in savefig
>> self.canvas.print_figure(*args, **kwargs)
>> File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py",
>> line 1310, in print_figure
>> **kwargs)
>> File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
>> line 347, in print_jpeg
>> return self._print_image(filename, 'jpeg')
>> File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
>> line 360, in _print_image
>> pixmap = gdk.Pixmap (self.window, width, height)
>> RuntimeError: could not create GdkPixmap object
>>
>> I am using matplotlib 0.98.3, pygtk 2.14.0. My system is a Linux Ubuntu:
>>
>> $ uname -a
>> Linux <blanket out> #1 SMP Wed Aug 20 18:39:13 UTC 2008 i686 GNU/Linux
>>
>> Does anyone know what is wrong?
>>
>> Best regards,
>> Jesper
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