图像单通道显示

import cv2
import numpy as np

# 读取图片
#img = cv2.imread("An.png", cv2.IMREAD_UNCHANGED)
img = cv2.imread("An.png", 1)
# 拆分通道
b, g, r = cv2.split(img)

# 显示原始图像
cv2.imshow("B", b)
cv2.imshow("G", g)
cv2.imshow("R", r)

# 等待显示
cv2.waitKey(0)