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# blend.py

from PIL import Image

def avg(x, y):

"""Return average of x and y."""

return (x + y)/2

def blend(img1, img2):

"""Return blend of two images of the same size."""

if img1.size != img2.size:

raise ValueError("Images are not the same size.")

width, height = img1.size

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

for j in range(height):

for i in range(width):

r1, g1, b1 = img1.getpixel((i, j))

r2, g2, b2 = img2.getpixel((i, j))

newimg.putpixel((i, j),

(int(avg(r1, r2)),

int(avg(g1, g2)),

int(avg(b1, b2))))

return newimg

def main():

try:

img1 = Image.open("lake.jpg")

img2 = Image.open("lake2.jpg")

newimg = blend(img1, img2)

newimg.save("lake_blend.jpg")

except (OSError, ValueError) as err:

print("Error:", err)

print("Unable to process blending.")

main()