python批量图片处理

#!/usr/bin/python
#coding:utf-8
import os
from PIL import Image
#源目录
MyPath = 'C:/Users/Eric/Desktop/python_text/20161214/test_Image/'
#输出目录
OutPath = 'C:/Users/Eric/Desktop/python_text/20161214/outpath/'
def processImage(filesoure, destsoure, name, imgtype):
'''
filesoure是存放待转换图片的目录
destsoure是存在输出转换后图片的目录
name是文件名
imgtype是文件类型
'''
imgtype = 'jpeg' if imgtype == '.jpg' else 'png'
#打开图片
im = Image.open(filesoure + name)
#缩放比例
rate =max(im.size[0]/640.0 if im.size[0] > 60 else 0, im.size[1]/1136.0 if im.size[1] > 1136 else 0)
if rate:
im.thumbnail((im.size[0]/rate, im.size[1]/rate))
im.save(destsoure + name, imgtype)
def run():
#切换到源目录，遍历源目录下所有图片
os.chdir(MyPath)
for i in os.listdir(os.getcwd()):
#检查后缀
postfix = os.path.splitext(i)[1]
if postfix == '.jpg' or postfix == '.png':
processImage(MyPath, OutPath, i, postfix)

if __name__ == '__main__':
run()