[Image-SIG] Is blend broken?

[Edward C. Jones]

Is Image.blend broken or did I make an error installing PIL?
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#! /usr/bin/python

import string, Image, zlib

x = Image.open('/home/edcjones/imagedb/dallas1.jpg')
z = Image.blend(x, x, .5)
print z.size
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Traceback (innermost last):
  File "./test.py", line 6, in ?
    z = Image.blend(x, x, .5)  
  File "/usr/lib/python1.5/site-packages/PIL/Image.py", line 835,
in blend
    return Image()._makeself(core.blend(im1.im, im2.im, alpha))
TypeError: argument 1: expected ImagingCore, None