Python处理图片

# -*- coding: UTF-8 -*-
from PIL import Image
import os
import sys
reload(sys)
sys.setdefaultencoding('utf-8')

def resize2(im):
    xsize, ysize = im.size
    xrate,yrate=xsize/720.0,ysize/1280.0
    print xrate,yrate
    if xrate<1 and yrate<1:
        return im
    elif xrate>1 and yrate>1:
        if xrate<=yrate:
            xsize,ysize=xsize/xrate,ysize/xrate
            im = im.resize((int(xsize),int(ysize)))
            box = (0, 0, 720, 1280)
            im = im.crop(box)
            return im
        else:
            xsize,ysize=xsize/yrate,ysize/yrate
            im = im.resize((int(xsize),int(ysize)))
            box = (0, 0, 720, 1280)
            im = im.crop(box)
            return im

if __name__=='__main__':
    oldpath=r'E:\log\oldjpg'
    newpath=r'E:\log\newpng'
    files= os.listdir(oldpath)
    for file in files:
        im=Image.open(os.path.join(oldpath,file))
        print im.format, im.size, im.mode
        im=resize2(im)
        im.save(os.path.join(newpath,file))

# 旋转
# out = im.rotate(45)
# 水平和垂直反转
# out = im.transpose(Image.FLIP_LEFT_RIGHT)
# out = im.transpose(Image.FLIP_TOP_BOTTOM)
# out = im.transpose(Image.ROTATE_90)
# out = im.transpose(Image.ROTATE_180)
# out = im.transpose(Image.ROTATE_270)
# 缩略图
# im.thumbnail((x//2, y//2))
# 拆分文件和路径
# os.path.split()
# 拆分文件名和后缀
# os.path.splittext()
# 把图片粘贴到原图的某个区域