Bug in transform function

Matt Brown <[email protected]> Thu, 01 Aug 2013 22:56:51 -0400

Newsgroups	gmane.comp.python.image
Message-ID	<[email protected]>

I noticed that the transform function appears to shift images by a half 
pixel. I ran an image through the identity transformation and it appears 
to shift by a half pixel.

import numpy as np

from PIL import Image


P = np.array([[1,0,0],[0,1,0]])
I2 = I.transform((100,100),Image.AFFINE, P, resample=Image.BICUBIC)

When I use P = np.array([[1,0,0.5],[0,1,0.5]]), then they are identical.


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