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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