python如何制作缩略图

import cv2 #导入opencv模块
from tkinter import * #导入tkinter模块
from tkinter import ttk #tkinter最新的主题部件
from PIL import Image

#初始化模块
root = Tk()
root.title('Pt')
root.geometry('600x300')
#查找图片路径，成功则显示图片
def searchPicture():
 location = locOfPicture.get()
 img = cv2.imread(location)
 cv2.imshow("Image",img)

#生成缩略图
def setPicture():
 # 获取图片路径
 location = locOfPicture.get()
 # 对图片进行操作
 im = Image.open(location)
 im.thumbnail((int(heightOfPicture.get()),int(widthOfPicture.get())))
 im.save(nameOfImg.get(),'JPEG')


label1 = ttk.Label(root,text='选择图片')
label2 = ttk.Label(root,text='长:')
label3 = ttk.Label(root,text='宽:')
label4 = ttk.Label(root,text='文件名')

#存储输入框中输入的变量
locOfPicture = StringVar()
heightOfPicture= StringVar()
widthOfPicture = StringVar()
nameOfImg = StringVar()

entry1 = ttk.Entry(root,textvariable = locOfPicture,width=50)
entry2 = ttk.Entry(root,textvariable=heightOfPicture,width=10)
entry3 = ttk.Entry(root,textvariable=widthOfPicture,width=10)
entry4 = ttk.Entry(root,textvariable=nameOfImg,width=25)

button1 = ttk.Button(root,text='确定',command=searchPicture)
button2 = ttk.Button(root,text='确定生成',command=setPicture)

#进行界面布局
label1.grid(column=0,row=0)
entry1.grid(column=1,row=0,columnspan=3)
button1.grid(column=4,row=0)
label2.grid(column=0,row=1)
entry2.grid(column=1,row=1)
label3.grid(column=2,row=1)
entry3.grid(column=3,row=1)
entry4.grid(column=1,row=2,columnspan=2)
button2.grid(column=3,row=2)

root.mainloop()

#!/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))