交换图片的左右两半

switch_pic

#!/usr/bin/python
#coding:utf-8

import sys
import PIL
from PIL import Image

if len(sys.argv) < 2:
    raise Exception("bad parameter")

fn = sys.argv[1] 

im = Image.open(fn)
width, height = im.size

mid = width / 2

box1 = (0, 0, mid, height)
box2 = (mid, 0, width, height)

region1 = im.crop(box1)
region2 = im.crop(box2)

im1 = Image.new('RGBA', (width, height))
im1.paste(region2, (0, 0))
im1.paste(region1, (mid, 0))

im1.save('x_' + fn)