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()
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