trackbar

gistfile1.txt

    int tv=13;
    namedWindow("win1");
    createTrackbar("win1","win1",&tv,100);
    Mat img(400,400,CV_8UC3,Scalar(200,80,80));
    while(1)
    {
        Mat m2 = img.clone();

        // do something with tv:
        m2 += Scalar::all(tv);
        imshow("win1",m2);
        if (waitKey(10)==27)
            break;
    }