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# double.py

from PIL import Image

def double(img):

"""Return copy of img with doubled width, height."""

width, height = img.size

newimg = Image.new("RGB", (2*width, 2*height))

for j in range(height):

for i in range(width):

color = img.getpixel((i, j))

newimg.putpixel((2*i, 2*j), color)

newimg.putpixel((2*i, 2*j + 1), color)

newimg.putpixel((2*i + 1, 2*j), color)

newimg.putpixel((2*i + 1, 2*j + 1), color)

return newimg

def main():

img = Image.open("lake.jpg")

newimg = double(img)

newimg.save("lake_double.jpg")

main()