python生成缩略图和合并图片代码

#!/usr/bin/env python
#coding=utf-8
'''
Created on 2012-6-2

@author: fatkun
'''
import Image
import os
import sys
import glob
import time

def make_thumb(path, thumb_path, size):
"""生成缩略图"""
img = Image.open(path)
width, height = img.size
# 裁剪图片成正方形
if width > height:
delta = (width - height) / 2
box = (delta, 0, width - delta, height)
region = img.crop(box)
elif height > width:
delta = (height - width) / 2
box = (0, delta, width, height - delta)
region = img.crop(box)
else:
region = img

# 缩放
thumb = region.resize((size, size), Image.ANTIALIAS)

base, ext = os.path.splitext(os.path.basename(path))
filename = os.path.join(thumb_path, '%s_thumb.jpg' % (base,))
print filename
# 保存
thumb.save(filename, quality=70)

def merge_thumb(files, output_file):
"""合并图片"""
imgs = []
width = 0
height = 0

# 计算总宽度和长度
for file in files:
img = Image.open(file)
if img.mode != 'RGB':
img = img.convert('RGB')
imgs.append(img)
if img.size[0] > width:
width = img.size[0]
height += img.size[1]

# 新建一个白色底的图片
merge_img = Image.new('RGB', (width, height), 0xffffff)
cur_height = 0
for img in imgs:
# 把图片粘贴上去
merge_img.paste(img, (0, cur_height))
cur_height += img.size[1]

merge_img.save(output_file, quality=70)

if __name__ == '__main__':
ROOT_PATH = os.path.abspath(os.path.dirname(__file__))
IMG_PATH = os.path.join(ROOT_PATH, 'img')
THUMB_PATH = os.path.join(IMG_PATH, 'thumbs')
if not os.path.exists(THUMB_PATH):
os.makedirs(THUMB_PATH)

# 生成缩略图
files = glob.glob(os.path.join(IMG_PATH, '*.jpg'))
begin_time = time.clock()
for file in files:
make_thumb(file, THUMB_PATH, 90)
end_time = time.clock()
print ('make_thumb time:%s' % str(end_time - begin_time))

# 合并图片
files = glob.glob(os.path.join(THUMB_PATH, '*_thumb.jpg'))
merge_output = os.path.join(THUMB_PATH, 'thumbs.jpg')
begin_time = time.clock()
merge_thumb(files, merge_output)
end_time = time.clock()
print ('merge_thumb time:%s' % str(end_time - begin_time))