批量调整图片尺寸的python脚本

#coding:utf-8
#author:solu

import sys, os
from PIL import Image
from optparse import OptionParser

#遍历指定目录下的JPG图片，返回list
def walk_dir(dir):
    image_list = []
    for root, dirs, files in os.walk(dir):
        for name in files:
            ext = os.path.splitext(name)[1][1:]
            if (ext.lower() == 'jpg'):
                path = root + os.sep + name
                image_list.append(path)
    return image_list

#保存图片,默认保存在图片目录下的thumb
def resize_save(im, width, path):
    image_name = im.filename.split(os.sep)[-1]
    save_name = path + os.sep + image_name
    size = auto_resize(im, width)
    new_im = im.resize(size)
    print save_name
    new_im.save(save_name)

#调整宽高
def auto_resize(im, width):
    size = im.size
    height = int(float(width) / size[0] * size[1])
    return (int(width), height)

if __name__ == '__main__':
    usage_msg = 'usage: %prog -p <image_path> -w <image_width>'
    parser = OptionParser(usage_msg)
    parser.add_option("-p","--path", dest = "image_path", help = u"存放相片的路径")
    parser.add_option("-w","--width", dest = "image_width", help = u"调整后的图片宽度(高度会自等比例缩放)")
    options, args = parser.parse_args()
    if not options.image_path or not options.image_width:
        parser.print_help()
        sys.exit(1)

    try:
        image_path = unicode(options.image_path, 'gbk')
        width = options.image_width
        #创建文件夹
        save_path = image_path + os.sep + 'thumb'
        if (not os.path.exists(save_path)):
            os.mkdir(save_path)

        image_list = walk_dir(image_path)
        for path in image_list:
            im = Image.open(path)
            resize_save(im, width, save_path)
    except Exception,e:
        print('Error:',e)
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