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# Load the image into an array: image
image = plt.imread('640px-Unequalized_Hawkes_Bay_NZ.jpg')

# Display image in top subplot using color map 'gray'
plt.subplot(2,1,1)
plt.title('Original image')
plt.axis('off')
plt.imshow(image, cmap='gray')

# Assign pixels the flattened 1D numpy array image.flatten() 
pixels = image.flatten()

# Display a histogram of the pixels in the bottom subplot
plt.subplot(2,1,2)
plt.xlim((0,255))
plt.title('Normalized histogram')
plt.hist(pixels, bins=64, color='red', alpha=0.4, range=(0,256), normed=True)
plt.show()