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([
    [3,3,0,5,0,3,3,0,4,1,1,1,4,0],
    [4,0,2,2,2,0,4,2,2,0,5,0,2,2],
    [1,1,0,5,0,1,1,4,0,3,3,3,0,4],
    [4,0,3,3,3,0,4,1,1,0,5,0,1,1],
    [2,2,0,5,0,2,2,4,0,2,2,2,0,4],
    [0,4,1,1,1,4,0,3,3,0,5,0,3,3],
    [4,0,3,3,3,0,4,1,1,0,5,0,1,1],
    [4,0,2,2,2,0,4,2,2,0,5,0,2,2],
    [3,3,0,5,0,3,3,0,4,1,1,1,4,0],
    [2,2,0,5,0,2,2,4,0,2,2,2,0,4],
    [1,1,0,5,0,1,1,4,0,3,3,3,0,4],
    [0,4,1,1,1,4,0,3,3,0,5,0,3,3],
])

# 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", "yellow", "green"])

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