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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)

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import os
from PIL import Image

def resize_images_in_folder(input_folder, output_folder, new_width, new_height):
    for filename in os.listdir(input_folder):
        if filename.endswith(".jpg") or filename.endswith(".png"):
            input_image_path = os.path.join(input_folder, filename)
            output_image_path = os.path.join(output_folder, filename)
            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)

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from PIL import Image

def resize_image(input_path, output_path, new_width, new_height):
    image = Image.open(input_path)
    width, height = image.size
    aspect_ratio = width / height

    if new_width is None:
        new_width = int(new_height * aspect_ratio)
    elif new_height is None:
        new_height = int(new_width / aspect_ratio)

    resized_image = image.resize((new_width, new_height), Image.ANTIALIAS)
    resized_image.save(output_path)

if __name__ == "__main__":
    input_path = "input.jpg"
    output_path = "output.jpg"
    new_width = 800
    new_height = None

    resize_image(input_path, output_path, new_width, new_height)

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import os
from PIL import Image

def resize_image(input_path, new_width, new_height):
    image = Image.open(input_path)
    width, height = image.size
    aspect_ratio = width / height

    if new_width is None:
        new_width = int(new_height * aspect_ratio)
    elif new_height is None:
        new_height = int(new_width / aspect_ratio)

    resized_image = image.resize((new_width, new_height), Image.ANTIALIAS)
    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"
    new_width = 800
    new_height = None

    resize_images_in_directory(target_directory, new_width, new_height)