python 批量縮放處理文件夾下的.JPG圖像

命令爲 ./this_file_name.py  your_image_folder scale_number

#! /usr/bin/python
# -*- coding: UTF-8 -*-

import argparse
from PIL import Image
import glob, os, shutil

if __name__ == "__main__":

    parser = argparse.ArgumentParser( description = "Resize images" )
    parser.add_argument("fn", help="folder name in the current dir")
    parser.add_argument("scale", help="The scale factor, eg 0.3 " ) 
    args = parser.parse_args()

    ratio = float(args.scale)
    fn =args.fn
    newfn = fn+"-thumbnail"
    if os.path.exists(newfn):
       shutil.rmtree(newfn)
    os.mkdir(newfn)
    for infile in glob.glob(fn+"/*.JPG"):
       file, ext = os.path.splitext(infile)
       im = Image.open(infile)
       ori_width = im.width 
       ori_height = im.height 
       file = file[len(fn):]
       new_wid = int(ori_width * ratio)
       new_hei = int(ori_height * ratio)
       im.thumbnail((new_wid, new_hei), Image.ANTIALIAS)
       im.save(newfn+file+".jpg", "JPEG")