import matplotlib.pyplot as plt

image=plt.imread('essai.jpg')
copie=image.copy()

plt.imshow(image)
plt.show()

copie[:,:,(0,2)]=0
plt.imshow(copie)
plt.show()

image=image[:,:,0]
image=image/255
plt.imshow(image,cmap='gray')
plt.show()

image=image<0.5
plt.imshow(image,cmap='gray')
plt.show()