opencv

1、cv2.split, cv2.merge
cv2.split分割颜色通道
cv2.merge合并颜色通道

import numpy as np
import cv2 as cv
from matplotlib import pyplot as plt

img = cv.imread('messi.jpg',-1)  # cv2读取彩色图片的颜色通道顺序为 BGR
b, g, r = cv.split(img)
imgInv = cv.merge([r,g,b])
plt.imshow(imgInv, interpolation='bicubic') # matplotlib 读取彩色图片的颜色通道顺序为 RGB
plt.show()