%matplotlib inline

import numpy as np
import matplotlib.pyplot as plt

from PIL import Image
img = Image.open('small_school.png')

img_data = np.array(img)
img_data.shape

type(img_data)

plt.imshow(img_data, cmap='gray', interpolation='nearest')

img_data

orig_shape = img_data.shape
n_pixels = np.prod(orig_shape)
n_pixels

24 * 30

flat_image = img_data.reshape(n_pixels)
flat_image.shape

img_2d_again = flat_image.reshape(orig_shape)

plt.imshow(img_2d_again, cmap='gray', interpolation='nearest')