修改图片分辨率，python实现修改图片分辨率（大小）

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 Imagedef 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 = 600resize_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 Imagedef 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 = 600resize_images_in_folder(input_folder, output_folder, new_width, new_height)

3.等比例修改图片分辨率（大小）

from PIL import Imagedef resize_image(input_path, output_path, new_width, new_height):# 打开图片image = Image.open(input_path)# 计算缩放比例width, height = image.sizeaspect_ratio = width / heightif new_width is None:new_width = int(new_height * aspect_ratio)elif new_height is None:new_height = int(new_width / aspect_ratio)# 缩放图片resized_image = image.resize((new_width, new_height), Image.ANTIALIAS)# 保存缩放后的图片resized_image.save(output_path)if __name__ == "__main__":input_path = "input.jpg"  # 输入图片的文件路径output_path = "output.jpg"  # 输出图片的文件路径new_width = 800  # 新的宽度，设置为None以根据高度自动计算new_height = None  # 新的高度，设置为None以根据宽度自动计算resize_image(input_path, output_path, new_width, new_height)

4.递归实现等比例修改一个目录下所有目录的图片分辨率，并且覆盖之前图片

import os
from PIL import Imagedef resize_image(input_path, new_width, new_height):# 打开图片image = Image.open(input_path)# 计算缩放比例width, height = image.sizeaspect_ratio = width / heightif new_width is None:new_width = int(new_height * aspect_ratio)elif new_height is None:new_height = int(new_width / aspect_ratio)# 缩放图片resized_image = image.resize((new_width, new_height), Image.ANTIALIAS)# 覆盖原始图片resized_image.save(input_path)def resize_images_in_directory(directory, new_width, new_height):for root, dirs, files in os.walk(directory):for filename in files:if filename.lower().endswith(('.jpg', '.jpeg', '.png', '.gif')):input_path = os.path.join(root, filename)resize_image(input_path, new_width, new_height)if __name__ == "__main__":target_directory = "your_directory_path"  # 指定要处理的目录的路径new_width = 800  # 新的宽度，设置为None以根据高度自动计算new_height = None  # 新的高度，设置为None以根据宽度自动计算resize_images_in_directory(target_directory, new_width, new_height)

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