On 23/07/11 23:17, Benjamin Root wrote:
On Sat, Jul 23, 2011 at 2:53 PM, robert rottermann <robert.rotterm...@gmx.ch <mailto: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
------------------------------------------------------------------------------ Storage Efficiency Calculator This modeling tool is based on patent-pending intellectual property that has been used successfully in hundreds of IBM storage optimization engage- ments, worldwide. Store less, Store more with what you own, Move data to the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/
_______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
