[Image-SIG] unable to make PIL work with cairo

[wecing]

I wrote my code like this:

>     def video_observer(self, f):
>
>         img = Image.frombuffer('RGB', (self._width, self._height), f.data,
>> \
>
>                                'raw', 'RGB', 0, 1)
>
>
>>         img = img.resize((self.nwidth, self.nheight))
>
>         img.save('%d.jpg' % self.cnt, 'JPEG') # debug! :-P
>
>
>
>         imgd = img.tostring('raw', 'RGBA', 0, 1)
>
>         a = array.array('B', imgd)
>
>
>>         surface = cairo.ImageSurface.create_for_data(a,
>> cairo.FORMAT_ARGB32, \
>
>             self.nwidth, self.nheight, self.nwidth * 4) # self.nwidth * 4
>
>
>>         surface.write_to_png('%d.png' % self.cnt)
>
>
>>         self.context.set_source_surface(surface, 0, 0)
>
>         self.context.paint()
>
>
Output of img.save() is perfectly correct, but...

>   File "main.py", line 98, in video_observer

    imgd = img.tostring('raw', 'RGBA', 0, 1)

  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 535, in
> tostring

    e = _getencoder(self.mode, encoder_name, args)

  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 399, in
> _getencoder

    return apply(encoder, (mode,) + args + extra)

SystemError: unknown raw mode


Why?
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