OpenCV RBG image channel splitting(C++)

RBG_image_channel_splitting

VideoCapture cap(0);
if(!cap.isOpened()) exit(0);

cap.set(CV_CAP_PROP_FRAME_WIDTH, 250);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 250);

cout << "Frame width: " << cap.get(CV_CAP_PROP_FRAME_WIDTH) << endl;
cout << "Frame height: " << cap.get(CV_CAP_PROP_FRAME_HEIGHT) << endl;


Mat in;
vector<Mat> rgb;

cap >> in;

rgb.push_back( Mat(in.rows, in.cols, CV_8UC1));
rgb.push_back( Mat(in.rows, in.cols, CV_8UC1));
rgb.push_back( Mat(in.rows, in.cols, CV_8UC1));
rgb.push_back( Mat(in.rows, in.cols, CV_8UC1));


namedWindow("original", 1);
namedWindow("red", 1);
namedWindow("green", 1);
namedWindow("blue", 1);

	for(;;){

		cap >> in;

		imshow("original", in);

		split(in, rgb);
                // not sure if this is the rigth order
		imshow("red", rgb.at(2));
		imshow("green", rgb.at(1));
		imshow("blue", rgb.at(0));

		if(waitKey(30) >= 0) break;
	}