Python实现批量修改图片格式和大小的方法【opencv库与PIL库】

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本文实例讲述了Python实现批量修改图片格式和大小的方法。分享给大家供大家参考，具体如下：

第一种方法用到opencv库

import os
import time
import cv2
def alter(path,object):
  result = []
  s = os.listdir(path)
  count = 1
  for i in s:
    document = os.path.join(path,i)
    img = cv2.imread(document)
    img = cv2.resize(img, (20,20))
    listStr = [str(int(time.time())), str(count)]
    fileName = ''.join(listStr)
    cv2.imwrite(object+os.sep+'%s.jpg' % fileName, img)
    count = count + 1
alter('C:\\imgDemo','C:\\imgDemo1')

第二种方法用到PIL库

import os
import time
from PIL import Image
def alter(path,object):
  s = os.listdir(path)
  count = 1
  for i in s:
    document = os.path.join(path,i)
    img = Image.open(document)
    out = img.resize((20,20))
    listStr = [str(int(time.time())), str(count)]
    fileName = ''.join(listStr)
    out.save(object+os.sep+'%s.jpg' % fileName)
    count = count + 1
alter('C:\\imgDemo','C:\\imgDemo1')

运行上述代码可得到C:\imgDemo目录下对应批量生成的20*20大小的图片。

运行效果如下：