Python 练习册 5-调整文件夹内所有图片的分辨率

目标

解决方案

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
你有一个目录，装了很多照片，把它们的尺寸变成都不大于 iPhone5 分辨率的大小。
"""

import os
from PIL import Image

IPHONE5_WIDTH = 1136
IPHONE5_HEIGHT = 640

# 改变图片的尺寸大小
def reset_pic_size(file_path, new_path, width=IPHONE5_WIDTH, height=IPHONE5_HEIGHT):
image = Image.open(file_path)
image_width, image_height = image.size

if image_width > width:
image_height = width * image_height // image_width
image_width = width
if image_height > height:
image_width = height * image_width // image_height
image_height = height

new_image = image.resize((image_width, image_height), Image.ANTIALIAS)
new_image.save(new_path)

# 从文件夹中循环改变每一张图片
def find_and_resize_pic_from_dir(dir_path):
for root, dirs, files in os.walk(dir_path):
for file_name in files:
if file_name.lower().endswith('jpg') or file_name.lower().endswith('png'):
file_path = os.path.join(root, file_name)
file_new_path = 'iPhone5_' + file_name
reset_pic_size(file_path=file_path, new_path=file_new_path)

find_and_resize_pic_from_dir('./')