On Sat, Jul 23, 2011 at 4:50 PM, robert rottermann <robert.rotterm...@gmx.ch
> wrote:
> **
> On 23/07/11 23:17, Benjamin Root wrote:
>
> On Sat, Jul 23, 2011 at 2:53 PM, robert rottermann <
> robert.rotterm...@gmx.ch> wrote:
>
>> thanks ben,
>> (sorry for sending answer twice)
>>
>> > When you call savefig(), you can pass it the kwarg option of
>> > bbox_inches='tight' and that should help get rid of any extra area you
>> > may have.
>> >
>> > Ben Root
>> I tried to follow your advice. however it did not help. This is what I
>> do:
>>
>> - get the current figure with gcf.
>> - read an image from a file with imread
>> - save it to the canvas with imsave
>> - hide the axes
>> - call fig.savefig('out.svg', transparent=True, bbox_inches='tight',
>> pad_inches=0)
>>
>> then I create a PIL Image and return it to the calling web server.
>>
>> The image is displayed with a fat (1.5 cm) gray border which I do not
>> want.
>>
>> thanks for any further intelligence
>>
>> robert
>>
>> here is my code cleansed of irrelevant parts
>>
>> # supporting method creating the plot
>> def makeHlwdChart(self, values = ['a', 'd', 'e', 'f', 'b']):
>> # get current axes object
>> frame1 = plt.gca()
>> # get current figure
>> fig = plt.gcf()
>> # read the image file
>> pic = plt.imread(imp_path)
>> # the picture is upside down so rotate and fip it
>> pic = np.fliplr(np.rot90(pic, k=2))
>> # draw it on the canvas
>> plt.imshow(pic, figure=fig)
>> # hide axes
>> frame1.axes.get_xaxis().set_visible(False)
>> frame1.axes.get_yaxis().set_visible(False)
>>
>> fig.savefig('out.svg', transparent=True, bbox_inches='tight',
>> pad_inches=0)
>>
>> return pic
>>
>> # method called from the web server
>> def __call__(self, w=300, h=300, default_format = 'PNG',
>> set_headers=False):
>> # lock graphics
>> imageThreadLock.acquire()
>> # we don't want different threads to write on each other's canvases,
>> # make sure we have a new one
>> pylab.close()
>> # makeHlwdChart draws on the canvas, so we do not need its return
>> value
>> makeHlwdChart(self, values)
>> canvas = pylab.get_current_fig_manager().canvas
>> canvas.draw()
>> imageSize = canvas.get_width_height()
>> imageRgb = canvas.tostring_rgb()
>> img = Image.fromstring("RGB", imageSize, imageRgb)
>> #size = int(w), int(h)
>> #img.thumbnail(size, Image.ANTIALIAS)
>> format = img.format and img.format or default_format
>> thumbnail_file = StringIO()
>> ## quality parameter doesn't affect lossless formats
>> img.save(thumbnail_file, format, quality=88)
>> thumbnail_file.seek(0)
>> if set_headers:
>> self.request.RESPONSE.setHeader('Pragma', 'no-cache')
>> self.request.RESPONSE.setHeader('Content-Type', 'image/%s' %
>> format)
>>
>> # unlock graphics
>> imageThreadLock.release()
>>
>> return thumbnail_file.getvalue()
>>
>>
> Does the image look correct if you save it as a PNG file? It might be a
> problem with the SVG backend. Also, which version of matplotlib are you
> using. There was a lot of work on the bbox_inches stuff and this problem
> might have already been fixed.
>
> Ben Root
>
> using png did not help,
>
> matplotlib.__version__ : 0.99.3
> numpy: 1.5.1
>
> as provided by the newest ubuntu
>
>
> thanks
> robert
>
> Ok, your version is quite old, and might be older than when the
bbox_inches='tight' feature was added. Unfortunately, the way savefig was
designed, I think it would swallow extra kwargs.
The current matplotlib is version 1.0.1, and we are getting close to cutting
a new v1.1.0 release. Debian (which Ubuntu is based on), had a policy
conflict with how we packaged our documents and did not update matplotlib in
their repositories (although it should be updated in time for their next
release). I would recommend building from source:
http://matplotlib.sourceforge.net/users/installing.html#installing-from-source
Note that you can obtain all of the required packages for building by
running:
sudo apt-get build-dep python-matplotlib
and then build matplotlib yourself from source.
I hope this helps!
Ben Root
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