[Numpy-discussion] array is not writable

Mark Wendell mark.wendell@gmail....
Wed Aug 26 20:48:46 CDT 2009

Hi all - I'm playing with editing image data converted from PIL objects, and
running into a situation where numpy tells me that an 'array is not
writable'. Not sure I understand what that means, or how to get around it.
Here's a sample interactive session:

>>> import Image
>>> import numpy as np
>>> im = Image.open("rgb.0001.jpg")
>>> a = np.asarray(im)
>>> a.shape
(512, 512, 3)
>>> a.dtype
>>> a[0,0,0]
>>> a[0,0,0] = 10
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: array is not writeable

Any help appreciated. Thanks,

PIL 1.1.6
numpy 1.2.1
Ubuntu 9.04

Mark Wendell
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