[Python] How to create a white image in Python?

The following code creates a black picture:

from scipy.misc import imread,imsave
from numpy import zeros

img = zeros([100,100,3])
for y in range(len(img)):
for x in range(len(img[0])):
img[y,x] = [255,255,255]
imsave("Result.jpg",img)


I would have assumed it to be white.

Edit in 2024: The code block is deprecated and won't run anymore.

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