This appears to be DPI dependent.

Changing the last line of Richard's example to

plt.savefig("grap.png")

gives a PNG with a shadow similar to that generated by TkAgg.

--Mark

On 09/03/2015 01:17 PM, Sterling Smith wrote:
> For those who wonder what he means:
> on the left is TkAgg; on the right is png.
>
> -Sterling
>
> On Sep 3, 2015, at 1:13PM, Richard Stanton <stan...@haas.berkeley.edu
> <mailto:stan...@haas.berkeley.edu>> wrote:
>
>> A quick follow-up: if I export to a jpg file, I get the same huge shadow. If 
>> I
>> export to a PDF file, the shadow looks much more like it does on the screen.
>>
>>
>>> On Sep 3, 2015, at 1:07 PM, Richard Stanton <stan...@haas.berkeley.edu
>>> <mailto:stan...@haas.berkeley.edu>> wrote:
>>>
>>> I’m trying to create a pie chart for a presentation. If I turn on shadows,
>>> they look fine on the screen (in an IPython notebook), but when I export the
>>> file to a PNG file, the shadow is way larger, and looks pretty ugly. Is this
>>> a bug? And is there a way to shrink the size of the shadow?
>>>
>>> Here’s some sample code that shows the problem:
>>>
>>> import matplotlib.pyplot as plt
>>> numbers = [4380.0, 2474.0, 158]
>>> explode=(0, 0, 0.5)
>>> plt.pie(numbers, explode=explode,shadow=True)
>>> plt.axis('equal')
>>> plt.savefig(‘grap.png’, dpi=400)
>>>
>>> Thanks for any suggestions.
>>>
>>> By the way, I’m using Matplotlib version 1.4.3 with the Anaconda 
>>> distribution
>>> under OS X.
>>>
>>> Richard Stanton
>>
>>
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