Q11 of python challenge

python_challenge_q11.py

from PIL import Image
img = Image.open("cave.jpg")
c,r = img.size
pix = img.load()
for j in range(r-1):
    for i in range(c):
        if (i+j)%2:
            pix[i,j] = pix[i,j+1]
img.show()
# 注意也可以用 img.getpixel 和 img.putpixel 来操作像素。