用python来缩放图片

#!/usr/bin/env python
# $Id: thumbnails_create.py 5 2007-05-10 05:44:05Z zhuzhu $
# first you must install Python Imaging Library (PIL) at
# http://www.pythonware.com/products/pil/
import os, sys
import Image
import glob

size = [580,1024]
files = glob.glob('*.jpg')
# files = ["Leah_Dizon_613516.jpg"]

for infile in files:
    im = Image.open(infile)
    if im.size[0] > size[0]:
        how = (size[0]*100)/im.size[0]
        outfile = os.path.splitext(infile)[0] + ".webcan.jpg"
        if infile != outfile:
            try:
                im = im.resize((size[0], (im.size[1]*how)/100), Image.BILINEAR)
                im.save(outfile, "JPEG")
                print outfile+" is created"
            except IOError:
                print "cannot create thumbnail for", infile
    else:
        print "not need create thumbnail for", infile