修改图片分辨率，python实现修改图片分辨率

1.修改一张图片分辨率

将input.jpg和output.jpg改成自己的输入输出文件路径

from PIL import Image

def resize_image(input_image_path, output_image_path, new_width, new_height):
    image = Image.open(input_image_path)
    resized_image = image.resize((new_width, new_height))
    resized_image.save(output_image_path)

# 使用示例
input_image_path = "input.jpg"
output_image_path = "output.jpg"
new_width = 800
new_height = 600

resize_image(input_image_path, output_image_path, new_width, new_height)

2.将一个目录（文件夹）上的所有图片修改成相同的分辨率

import os
from PIL import Image

def resize_images_in_folder(input_folder, output_folder, new_width, new_height):
    # 遍历输入文件夹中的所有文件
    for filename in os.listdir(input_folder):
        if filename.endswith(".jpg") or filename.endswith(".png"):
            # 构建输入和输出文件的路径
            input_image_path = os.path.join(input_folder, filename)
            output_image_path = os.path.join(output_folder, filename)
            
            # 调用resize_image函数修改图片分辨率
            resize_image(input_image_path, output_image_path, new_width, new_height)

def resize_image(input_image_path, output_image_path, new_width, new_height):
    image = Image.open(input_image_path)
    resized_image = image.resize((new_width, new_height))
    resized_image.save(output_image_path)

# 使用示例
input_folder = "input_folder"
output_folder = "output_folder"
new_width = 800
new_height = 600

resize_images_in_folder(input_folder, output_folder, new_width, new_height)