import matplotlib.pyplot as plt
import numpy as np

# 图片左右翻转
img_arr = plt.imread("1.jpg")
img = img_arr[:, ::-1, :]  # [行, 列, 颜色]
plt.imshow(img)
plt.show()

# 图片上下翻转
img = img_arr[::-1, :, :]
plt.imshow(img)
plt.show()

# 对颜色翻转：RGB=>BGR
img = img_arr[:, :, ::-1]
plt.imshow(img)
plt.show()

# 图片裁剪
img = img_arr[20:100, 20:100, :]
plt.imshow(img)
plt.show()

# axis=1横向拼图，axis=0纵向拼图
img = np.concatenate((img_arr, img_arr, img_arr), axis=1)
plt.imshow(img)
plt.show()