Jesper Larsen wrote:
> Hi mpl users,
>
> I am trying to save a figure to a file like object (a StringIO object)
> and load this object into PIL (Python Imaging Library). The code for
> this is really simple (fig is my figure object):
>
> # This works
> fig.savefig('test.png', format='png')
> im = Image.open('test.png')
>
> # This fails
> imgdata = StringIO.StringIO()
> fig.savefig(imgdata, format='png')
> im = Image.open(imgdata)
>
> File "/home/jl/testfile.py", line 551, in contour
> im = Image.open(imgdata)
> File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1916, in open
> raise IOError("cannot identify image file")
> IOError: cannot identify image file
>
You need to "rewind" the StringIO cursor before opening with PIL:
imgdata = StringIO.StringIO()
fig.savefig(imgdata, format='png')
imgdata.seek(0)
im = Image.open(imgdata)
Hope that helps,
Mike
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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