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本文实例为大家分享了python实现批量按比例缩放图片的具体代码，供大家参考，具体内容如下

把脚本文件放在要缩放的文件夹下面。

双击运行脚本,输入要缩放的系数。脚本会在当前目录下创建一个scaledImg_xxxx文件夹,如果已经存在，会强制删除，如果删除失败会提示手动删除这个文件夹，再双击运行就可以了。

resizeImg.py

#!/usr/bin/python 
# -*- coding:utf8 -*- 
 
#author@skillart www. 
 
import os 
import shutil 
import Image  
to_scale = 0.5 
processIndex = 0 
def resizeImg(imgPath): 
  global processIndex 
  fileList = [] 
  files = os.listdir(imgPath) 
  for f in files: 
    filePath = imgPath + os.sep + f 
    if(os.path.isfile(filePath)): 
      fileList.append(f) 
    elif(os.path.isdir(filePath)): 
      resizeImg(filePath) 
  for fileName in fileList: 
    processIndex+=1 
    fileFullName = imgPath+os.sep+fileName 
    suffix = fileName[fileName.rfind('.'):] 
    if(suffix == '.png' or suffix == '.jpg'): 
      print 'processing the '+str(processIndex)+'th file:'+fileFullName 
      img = Image.open(fileFullName) 
      w,h = img.size 
      tw = int(w * to_scale) 
      th = int(h * to_scale) 
      reImg = img.resize((tw,th),Image.ANTIALIAS) 
      reImg.save(fileFullName) 
      del reImg 
if __name__ == '__main__': 
  scaleStr = raw_input('input to_scale: ') 
  to_scale = float(scaleStr) 
  scaledPath = '.\\scaledImg_xxxx'; 
  if os.path.isdir(scaledPath): 
    flag = raw_input('the output dir is exist, sure to del it(y/n)') 
    if flag == 'y' or flag == 'yes': 
      try:   
        shutil.rmtree(scaledPath) 
      finally: 
        raw_input('remove dir failed , please removed the dir manually.') 
    else: 
      exit 
  shutil.copytree('.\\',scaledPath)   
  resizeImg(scaledPath) 
  raw_input("resize success")

生成Icon

generateIcon.py

#!/usr/bin/python 
# -*- coding:utf8 -*- 
 
#author@skillart www. 
 
import os 
import shutil 
import Image  
def resizeImg(imgPathName): 
  print imgPathName 
  iconDict = {'Icon.png':'72x72','Icon@2x.png':'144x144','Icon-29.png':'29x29','Icon-40.png':'40x40','Icon-50.png':'50x50', 
  'Icon-57.png':'57x57', 'Icon-58.png':'58x58','Icon-72.png':'72x72','Icon-76.png':'76x76','Icon-80.png':'80x80', 
  'Icon-100.png':'100x100','Icon-114.png':'114x114','Icon-120.png':'120x120','Icon-144.png':'144x144','Icon-152.png':'152x152', 
  'FlipCycleTileLarge.png':'300x300','FlipCycleTileMedium.png':'300x300','FlipCycleTileSmall.png':'300x300', 
  'IconicTileMediumLarge.png':'300x300','IconicTileSmall.png':'300x300','ApplicationIcon.png':'300x300','icon.png':'72x72'} 
  if os.path.isfile(imgPathName) == False: 
    print('open imgPathName failed , check the' + imgPathName + "is exist!") 
    exit 
  img = Image.open(imgPathName) 
  index = imgPathName.rfind(os.sep) 
  prefix = imgPathName[:index+1] 
  for key, value in iconDict.items(): 
    # print key,value 
    v_split = value.split('x') 
    w,h = int(v_split[0]),int(v_split[1]) 
    fileName = prefix + key 
    reImg = img.resize((w,h),Image.ANTIALIAS) 
    reImg.save(fileName) 
    print fileName,w,h 
  del img 
if __name__ == '__main__': 
  scaledPath = '.\\createIcon' 
  if os.path.isdir(scaledPath): 
    flag = raw_input('the output dir is exist, sure to del it(y/n)') 
    if flag == 'y' or flag == 'yes': 
      try:   
        shutil.rmtree(scaledPath) 
      finally: 
        raw_input('remove dir failed , please removed the dir manually.') 
    else: 
      exit 
  shutil.copytree('.\\',scaledPath)  
  fileList = [] 
  files = os.listdir(scaledPath) 
  for f in files: 
    filePath = scaledPath + os.sep + f 
    if os.path.isfile(filePath) : 
      suffix = filePath[filePath.rfind('.'):] 
      if(suffix == '.png' or suffix == '.jpg'): 
        print filePath 
        resizeImg(filePath) 
        break 
  raw_input("resize success")

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持【听图阁-专注于Python设计】。