import matplotlib.pyplot as plt
import numpy as np

# 0〜2の数字を色に対応させる
pixels = np.array([
    [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,1,2,3,2,1,0,0,0,0,0,0],
    [0,0,0,0,0,1,3,6,7,6,3,1,0,0,0,0,0],
    [0,0,0,0,1,4,1,7,1,7,1,4,1,0,0,0,0],
    [0,0,0,1,5,6,3,9,6,9,3,6,5,1,0,0,0],
    [0,0,1,6,3,5,9,9,5,9,9,5,3,6,1,0,0],
    [0,1,7,1,5,8,4,4,4,4,4,8,5,4,7,1,0],
    [1,8,9,4,5,8,7,3,3,3,7,8,9,7,3,8,1],
])

# カラーマップを自作（0=白, 1=青, 2=赤）
from matplotlib.colors import ListedColormap
cmap = ListedColormap(["white","red", "blue", "green", "yellow", "black", "pink", "purple", "orange", "gray",])

plt.imshow(pixels, cmap=cmap, interpolation='nearest')
plt.axis('off')
plt.show()