import cv2 as cv
import numpy as np
print("--------- Hello Python ---------")
src = cv.imread("D:/test.jpg")
b, g, r = cv.split(src)#分离三个通道
cv.imshow("blue", b)#蓝色
cv.imshow("green", g)#绿色
cv.imshow("red", r)#红色
#cv.imshow("changed image of Red", src)
src = cv.merge([b, g, r])
src[:, :, 0] = 0#最后的通道2数据变成0
cv.imshow("changed image", src)
cv.waitKey(0)
cv.destroyAllWindows()
效果图如下：