查找负责降低图像不透明度的代码

from PIL import Image

def reduce_opacity(image, opacity):
    """
    降低图像不透明度的函数
    :param image: PIL图像对象
    :param opacity: 不透明度，取值范围为0-1，0表示完全透明，1表示完全不透明
    :return: 处理后的图像对象
    """
    assert 0 <= opacity <= 1, "Opacity must be between 0 and 1"
    if image.mode != 'RGBA':
        image = image.convert('RGBA')
    else:
        image = image.copy()

    alpha = image.split()[3]
    alpha = alpha.point(lambda p: p * opacity)
    image.putalpha(alpha)

    return image

# 示例用法
image_path = 'path/to/image.png'
image = Image.open(image_path)
reduced_opacity_image = reduce_opacity(image, 0.5)
reduced_opacity_image.save('path/to/output.png')