Re: [Matplotlib-users] savefig bug

[Michael D. <md...@st...>]

I think Jae-Joon's assesment is correct, since the logical dpi in PS is 
hardcoded to 72.0.  I have made this change in the SVN repository.

Mike

Thomas Robitaille wrote:
> Thanks for your quick reply!
>
> I'll be patient and wait for the fix to be made in the SVN repository,  
> rather than trying to patch it myself. Do I need to add any  
> information to the bug report?
>
> Best,
>
> Thomas
>
> On Apr 21, 2009, at 1:06 PM, Jae-Joon Lee wrote:
>
>   
>> I can reproduce this bug with the current svn.
>>
>> It works correctly If you set dpi=72, but it seems that it would not
>> be an option in your case.
>>
>> It seems to me that this is related with the change in r6847 that  
>> Michael made.
>>
>> http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/lib/matplotlib/backends/backend_ps.py?r1=6734&r2=6847
>>
>> At line 431 of the backend_ps.py,
>>
>>             clip = (0.0, 0.0, self.width * self.imagedpi,
>>  	                     self.height * self.imagedpi)
>>
>> I think we should use the dpi of the figure, instead of the imagedpi
>> of the renderer.
>> Replacing self.imagedpi with 72 (which is the dpi of the figure when
>> ps backend is used) seems to solve the problem.
>>
>> Thomas, I don't see any easy workaround for this bug other than
>> patching the code. Others may have better insight though.
>>
>> Regards,
>>
>> -JJ
>>
>>
>>
>> On Tue, Apr 21, 2009 at 9:59 AM, Thomas Robitaille
>> <tho...@gm...> wrote:
>>     
>>> Hi,
>>>
>>> I've come across a bug with the savefig method when using the dpi=
>>> argument and saving an EPS file. If you try the following code, you
>>> will see that the frame is incomplete. Is there a way to solve this
>>> from a user point of view?
>>>
>>> ---
>>>
>>> import matplotlib
>>> matplotlib.use('Agg')
>>> from matplotlib.pyplot import *
>>>
>>> import numpy as np
>>>
>>> nx,ny = 10,10
>>>
>>> image = np.random.random((nx,ny))
>>>
>>> fig = figure(figsize=(4,4))
>>> ax = fig.add_subplot(111)
>>> ax.imshow(image,interpolation='nearest')
>>> fig.savefig('plot.eps',dpi=30)
>>>
>>> ---
>>>
>>> I've submitted a bug report:
>>>
>>> https://sourceforge.net/tracker/?func=detail&aid=2777476&group_id=80706&atid=560720
>>>
>>> Thanks,
>>>
>>> Thomas
>>>
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>
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA