Python的PIL库中的composite方法

代码：

from PIL import Image
import matplotlib.pyplot as plt
img1 = Image.open("D:\\image_for_test\\windows.jpg")
img2 = Image.open("D:\\image_for_test\\Spee.jpg")
img1 = img1.resize(img2.size)
r,g,b = img2.split()
img = Image.composite(img1,img2,b)
plt.imshow(img1)
plt.show()
plt.imshow(img2)
plt.show()
plt.imshow(img)
plt.show()
print(b.mode)

结果：