Python3.7 练习题(三) 将指定目录下的图片进行批量尺寸大小处理

# 将指定目录下的图片进行批量尺寸大小处理

#修改图片尺寸  导入Image os 快捷键 alt+enter
import os
from PIL import Image


def process_image(filename,width = 640,hight = 1136):
    image = Image.open(filename)
    image_width = image.width
    image_height = image.height
    if image_width <= width and image_height <= hight:
        print(filename," is ok")
        return
    if 1.0*image_width/width > 1.0*image_height/hight:
        scale = 1.0 * image_width/width
        new_image = image.resize((int(image_width/scale),int(image_height/scale)),Image.ANTIALIAS)
    else:
        scale = 1.0 * image_height/hight
        new_image = image.resize((int(image_width / scale), int(image_height / scale)), Image.ANTIALIAS)

    new_image.save("new--"+filename)
    new_image.close()


#获取目录下面的文件的后缀
ext = ['jpg','png','jpeg']
files = os.listdir('.')

for file in files:
    if file.split('.')[-1] in ext:
        process_image(file)