奇怪的问题，怎么解决，请看看。

tianfeng0418

import Image

im = Image.open('a.png')

r,g,b = im.split()

r.show()

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Traceback (most recent call last):
  File "a.py", line 5, in <module>
    r,g,b = im.split()
  File "/usr/lib/python2.6/site-packages/PIL/Image.py", line 1497, in split
    if self.im.bands == 1:
AttributeError: 'NoneType' object has no attribute 'bands'