# convert gray

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.image as mpimg

def makegray(image):
    return (image[:,:,0]+image[:,:,1]+image[:,:,2]) / 3

image = mpimg.imread('chulalongkorn.png')
plt.subplot(1, 2, 1)
plt.imshow(image)

red_img = image[:,:,0]
#gray = makegray(image)
plt.subplot(1, 2, 2)
#plt.imshow(gray, cmap='gray')
plt.imshow(red_img)
plt.show()