图像交叉

import numpy as np
import matplotlib.pylab as plt
import matplotlib.image as mpimg
im1=mpimg.imread('C:/Users/xpp/Desktop/Lena.png') #原始图像
im2=mpimg.imread('C:/Users/xpp/Desktop/Lena.png')/255
i=1
plt.figure(figsize=(18,15))
for alpha in np.linspace(0,1,20):
    plt.subplot(4,5,i)
    plt.imshow((1-alpha)*im1+alpha*im2)
    plt.axis('off')
    i +=1
    plt.subplots_adjust(wspace=0.05,hspace=0.05)
plt.show()