opencv cpp create single color image

#include <opencv2/opencv.hpp>

int main() {
    // Create a 400x400 black image
    cv::Mat image(400, 400, CV_8UC3, cv::Scalar(0, 0, 0));

    // Display the image
    cv::imshow("Black Image", image);
    cv::waitKey(0);

    return 0;
}