![](https://img2020.cnblogs.com/blog/1502586/202110/1502586-20211028122506214-294455294.png)
方式一
cv::Mat src(4, 3, CV_8UC3,cv::Scalar(10,20,30));
std::vector<cv::Mat> channels;
cv::split(src, channels);//将一幅多通道的图像的各个通道分离
std::cerr<<src<<std::endl;
std::cerr<<channels.at(0)<<std::endl; //输出B通道
std::cerr<<channels.at(1)<<std::endl; //输出G通道
std::cerr<<channels.at(2)<<std::endl; //输出R通道
![](https://img2020.cnblogs.com/blog/1502586/202111/1502586-20211112133443847-644525023.png)
方式二
cv::Mat src(4, 3, CV_8UC3,cv::Scalar(10,20,30));
cv::Mat aChannel[3];
cv::split(src, aChannel);//将一幅多通道的图像的各个通道分离
std::cerr<<src<<std::endl;
std::cerr<<aChannel[0]<<std::endl; //输出B通道
std::cerr<<aChannel[1]<<std::endl; //输出G通道
std::cerr<<aChannel[2]<<std::endl; //输出R通道
![](https://img2018.cnblogs.com/blog/1502586/201908/1502586-20190826195909661-1938417604.png)