PIL's ImageFile Parser and PNG's

Silfheed silfheed at gmail.com
Thu Nov 13 03:04:37 CET 2008


On Nov 12, 5:28 pm, Silfheed <silfh... at gmail.com> wrote:
> Heyas
>
> So I've been messing around with the PIL and PNG's and came across a
> little problem with PNG's.
>
> So just to clarify, I'm running with the standard ubuntu 8.04 python-
> imaging package that installs zlib and all the other goodies that go
> along to make the PIL work with PNG's nicely.
>
> So this works fine:
>
>  from PIL import Image
>  x = Image.open('some.png')
>  x.show()
>
> But if I try to get  a bit fancier and do
>  from PIL import ImageFile
>  p = ImageFile.Parser()
>  p.feed(open('some.png','rb').read())
>  image = p.close()
>  image.show()
>
> I get a traceback:
> Traceback (most recent call last):
>   File "basic_img.py", line 9, in <module>
>     image.show()
>   File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1450, in
> show
>     _showxv(self, title, command)
>   File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 2089, in
> _showxv
>     file = image._dump(format=format)
>   File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 477, in
> _dump
>     self.load()
>   File "/usr/lib/python2.5/site-packages/PIL/ImageFile.py", line 189,
> in load
>     s = read(self.decodermaxblock)
>   File "/usr/lib/python2.5/site-packages/PIL/PngImagePlugin.py", line
> 365, in load_read
>     return self.fp.read(bytes)
>   File "/usr/lib/python2.5/site-packages/PIL/ImageFile.py", line 300,
> in read
>     data = self.data[pos:pos+bytes]
> TypeError: 'NoneType' object is unsubscriptable
>
> But if all I do is change some.png to some.jpg (or gif), it works
> fine.   Am I doing something horribly wrong, or forget to compile
> something that was supposed to be compiled for PNG support?  Is it a
> known bug with a fix somewhere that I just haven't found (I've
> searched all over the PIL site)
>
> Thanks

oh and forgive the errant 's (as in PNG's...)



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