I am trying to divide an image into patches and visualize it but matplotlib keep showing totally incorrect output.

from PIL import Image
import os
def imgcrop(input, xPieces, yPieces):
    filename, file_extension = os.path.splitext(input)
    im = Image.open(input)
    imgwidth, imgheight = im.size
    height = imgheight // yPieces
    width = imgwidth // xPieces
    for i in range(0, yPieces):
        for j in range(0, xPieces):
            box = (j * width, i * height, (j   1) * width, (i   1) * height)
            a = im.crop(box)
            np_img = np.asarray(a)
            plt.imshow(np_img)

I used the method as follows:

imgcrop("cats.jpeg", 14, 14)

I got a 16 x 16 patches but in different colours entirely different from the image

code credit: #

Output: