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#!/usr/bin/env python3

# -*- coding: utf-8 -*-

# Author: xurongzhong#126.com wechat:pythontesting qq:37391319

# 技术支持 钉钉群：21745728(可以加钉钉pythontesting邀请加入)

# qq群：144081101 591302926 567351477

# CreateDate: 2018-6-12

# grayscale.py

from PIL import Image

def grayscale(img):

"""Return copy of img in grayscale."""

width, height = img.size

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

for j in range(height):

for i in range(width):

r, g, b = img.getpixel((i, j))

avg = (r + g + b) // 3

newimg.putpixel((i, j), (avg, avg, avg))

return newimg

def main():

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

newimg = grayscale(img)

newimg.save("lake_gray.jpg")

main()