python3图片缩放

python实现图片缩放非常简单，代码如下：

from PIL import Image
import shutil


def resize(input_path, output_path,new_size=(72,72)):
    img = Image.open(input_path)
    width = img.width
    height = img.height

    if len(new_size)==1:
        fix_size=new_size[0]
        if width > height:
            if width > fix_size:
                img = Image.open(input_path)
                new_width = fix_size
                new_height = int(new_width * height / width)
                out = img.resize((new_width, new_height), Image.ANTIALIAS)
                out.save(output_path)
            else:
                shutil.copy(input_path, output_path)
        else:
            if height > fix_size:
                img = Image.open(input_path)
                new_height = fix_size
                new_width = int(new_height * width / height)
                out = img.resize((new_width, new_height), Image.ANTIALIAS)
                out.save(output_path)
            else:
                shutil.copy(input_path, output_path)
    else:
        img = Image.open(input_path)
        out = img.resize(new_size, Image.ANTIALIAS)
        out.save(output_path)


if __name__ == '__main__':
    input_path='icon.png'
    output_path = 'new_icon.png'
    resize(input_path,output_path,new_size=(192,192))