opencv官方文档上写的，https://docs.opencv.org/master/dc/d2e/tutorial_py_image_display.html
Color image loaded by OpenCV is in BGR mode. But Matplotlib displays in RGB mode. So color images will not be displayed correctly in Matplotlib if image is read with OpenCV. Please see the exercises for more details.
import cv2 import numpy as np import matplotlib.pyplot as plt img = cv2.imread(‘messi4.jpg‘) b,g,r = cv2.split(img) img2 = cv2.merge([r,g,b]) #img2 = img[:,:,::-1] plt.subplot(121);plt.imshow(img) # expects distorted color plt.subplot(122);plt.imshow(img2) # expect true color plt.show() cv2.imshow(‘bgr image‘,img) # expects true color cv2.imshow(‘rgb image‘,img2) # expects distorted color cv2.waitKey(0) cv2.destroyAllWindows()
原文：https://www.cnblogs.com/jianyingzhou/p/11216163.html