python对原图片和加密后的图片进行混合生成新的图片

今天尝试用Caesar加密一张MNIST图片，然后和原来的图片进行混合，下面我把我的代码分享出来：

image1 = Image.open("./images1.png")
image2 = Image.open("./encrypted-caesar.png")

def changeImageSize(maxWidth, 
                    maxHeight, 
                    image):
    
    widthRatio  = maxWidth/image.size[0]
    heightRatio = maxHeight/image.size[1]

    newWidth    = int(widthRatio*image.size[0])
    newHeight   = int(heightRatio*image.size[1])

    newImage    = image.resize((newWidth, newHeight))
    return newImage
# Make the images of uniform size
image3 = changeImageSize(28, 28, image1)
image4 = changeImageSize(28, 28, image2)

# Make sure images got an alpha channel
image5 = image3.convert("RGBA")
image6 = image4.convert("RGBA")

# alpha-blend the images with varying values of alpha
alphaBlended1 = Image.blend(image5, image6, alpha=.2)
alphaBlended2 = Image.blend(image5, image6, alpha=.4)
alphaBlended3=Image.blend(image5,image6,alpha=.6)

# Display the alpha-blended images
# alphaBlended1.show()
# alphaBlended2.show()
alphaBlended1.save('blend1_2.png')
alphaBlended2.save('blend1_4.png')
alphaBlended3.save('blend1_6.png')

加密图片的代码请参考：
​​​ https://github.com/TomaszBorczyk/image-encryption-python​​

效果展示

原图

加密后的图片

混合后的图片

alpha 0.2

alpah 0.6

alpha 0.4