如何使用alpha_composite组合4张图片？

from PIL import Image
from PIL import ImageDraw

image1 = Image.open("image1.jpg")
image2 = Image.open("image2.jpg")
image3 = Image.open("image3.jpg")
image4 = Image.open("image4.jpg")

result = Image.new("RGBA", image1.size)

result.alpha_composite(image1)
result.alpha_composite(image2)
result.alpha_composite(image3)
result.alpha_composite(image4)

result.save("combined_image.jpg")