gistfile1.py

#!/usr/bin/python

from PIL import Image
import argparse
import os

def main():
    parser = argparse.ArgumentParser(description="Resave jpeg files multiple times")
    parser.add_argument("-n", "--number", default=500, type=int,
            help="Number of resaves, default: 500")
    parser.add_argument("-q", "--quality", default=95, type=int,
            help="Image quality between 1 and 95, default: 95")
    parser.add_argument("-k", "--keep", action="store_true",
            help="Keep all intermediate files, default: no")
    parser.add_argument("filename") 

    args = parser.parse_args()

    if args.quality < 1 or args.quality > 95:
        print("Error: Quality should be between 1 and 95")
        exit(1)

    name = args.filename
    name = name.split(".")[0]

    img = Image.open(args.filename)
    for i in range(args.number):
        new_name = name + "_" + str(i) + ".jpg" 
        img.save(new_name, quality=args.quality)
        img = Image.open(new_name)
        if not (args.keep or i == args.number - 1):
            os.remove(new_name)

if __name__=='__main__':
    main()