public static void zadanie3_9() {
        String sciezka = "E:/NETBEANS WORKSPACE/IZA3.jpg";
        Mat zdjecie = imread(sciezka);

        MatOfFloat ranges = new MatOfFloat(0f, 256f);
        Mat hist1 = new Mat();
        Mat hist2 = new Mat();
        Mat hist3 = new Mat();

        int rozmiar = 100;
        MatOfInt histSize = new MatOfInt(rozmiar);

        Imgproc.calcHist(Arrays.asList(zdjecie),new MatOfInt(0), new Mat(), hist1, histSize, ranges);
        Imgproc.calcHist(Arrays.asList(zdjecie),new MatOfInt(1), new Mat(), hist2, histSize, ranges);
        Imgproc.calcHist(Arrays.asList(zdjecie),new MatOfInt(2), new Mat(), hist3, histSize, ranges);


        int histW = (int) zdjecie.size().width, histH = (int) zdjecie.size().height;
        int binW = (int)Math.round((double) histW / rozmiar);
        Mat histImage = new Mat( histH, histW, CvType.CV_8UC3, new Scalar( 0,0,0) );

        Core.normalize(hist1, hist1, 0, histImage.rows(), Core.NORM_MINMAX); //normalizacja
        Core.normalize(hist2, hist2, 0, histImage.rows(), Core.NORM_MINMAX);
        Core.normalize(hist3, hist3, 0, histImage.rows(), Core.NORM_MINMAX);

        float[] hist1Data = new float[(int) (hist1.total() * hist1.channels())];
        hist1.get(0, 0, hist1Data);
        float[] hist2Data = new float[(int) (hist2.total() * hist2.channels())];
        hist2.get(0, 0, hist2Data);
        float[] hist3Data = new float[(int) (hist3.total() * hist3.channels())];
        hist3.get(0, 0, hist3Data);
        for( int i = 1; i < rozmiar; i++ ) {
            Imgproc.line(histImage, new Point(binW * (i - 1), histH - Math.round(hist1Data[i - 1])),
                    new Point(binW * (i), histH - Math.round(hist1Data[i])), new Scalar(255, 0, 0), 2);
            Imgproc.line(histImage, new Point(binW * (i - 1), histH - Math.round(hist2Data[i - 1])),
                    new Point(binW * (i), histH - Math.round(hist2Data[i])), new Scalar(0, 255, 0), 2);
            Imgproc.line(histImage, new Point(binW * (i - 1), histH - Math.round(hist3Data[i - 1])),
                    new Point(binW * (i), histH - Math.round(hist3Data[i])), new Scalar(0, 0, 255), 2);
        }