gk

 public void srednia() // srednia arytmetyczna
        {
            System.Drawing.Color pixel;
            double tmpkont = 0, kontrast = 0;
            double avg = 0, jasnosc = 0, tmpjasn = 0;
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);

                    avg = (pixel.R + pixel.G + pixel.B) / 3;
                    pixel = System.Drawing.Color.FromArgb((int)avg, (int)avg, (int)avg);

                    m_ekran.SetPixel(i - 1, j - 1, pixel);

                    tmpjasn += avg;
                }
            jasnosc = tmpjasn / (L * K);
            jasnosc = jasnosc * 100 / 255;

            label2.Text = "Jasność obrazu: " + (int)jasnosc + "%";

            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);
                    avg = (pixel.R + pixel.G + pixel.B) / 3;
                    tmpkont = tmpkont + ((avg - jasnosc) * (avg - jasnosc));

                }
            kontrast = System.Math.Sqrt(tmpkont / (L * K));
            kontrast = 100 * kontrast / 127;
            label3.Text = "Kontrast obrazu: " + (int)kontrast + "%";

            SetBitMap(ref m_ekran);
        }

        //------------------
        //------------------

        public void rgb_hls()
        {
            System.Drawing.Color pixel;
            double max = 0, min = 0, avg = 0, jasnosc = 0, tmpjasn = 0;
            double kontrast = 0, tmpkont = 0;
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);

                    max = pixel.G;
                    if (pixel.R > pixel.G) max = pixel.R;
                    if (pixel.B > max) max = pixel.B;

                    min = pixel.G;
                    if (pixel.R < pixel.G) min = pixel.R;
                    if (pixel.B < min) min = pixel.B;

                    avg = (max + min) / 2;
                    pixel = System.Drawing.Color.FromArgb((int)avg, (int)avg, (int)avg);

                    m_ekran.SetPixel(i - 1, j - 1, pixel);

                    tmpjasn += avg;
                }
            jasnosc = tmpjasn / (L * K);
            jasnosc = (jasnosc * 100) / 255;
            tmpkont += ((avg - jasnosc) * (avg - jasnosc));
            label2.Text = "Jasność obrazu: " + (int)jasnosc + "%";

            // kontrast
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);
                    avg = (pixel.R + pixel.G + pixel.B) / 3;
                    tmpkont = tmpkont + ((avg - jasnosc) * (avg - jasnosc));

                }

            kontrast = System.Math.Sqrt(tmpkont / (L * K));
            kontrast = 100 * kontrast / 127;
            label3.Text = "Kontrast obrazu: " + (int)kontrast + "%";
            SetBitMap(ref m_ekran);
        }

        public void rgb_hsvb()
        {
            System.Drawing.Color pixel;
            double max = 0, tmpjasn = 0, jasnosc = 0;
            double tmpkont = 0, kontrast = 0;
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);

                    if (pixel.R > pixel.G) max = pixel.R;
                    else max = pixel.G;
                    if (max < pixel.B) max = pixel.B;

                    pixel = System.Drawing.Color.FromArgb((int)max, (int)max, (int)max);

                    tmpjasn += max;


                    m_ekran.SetPixel(i - 1, j - 1, pixel);
                }
            jasnosc = tmpjasn / (L * K);
            jasnosc = (jasnosc * 100) / 255;
            tmpkont += ((max - jasnosc) * (max - jasnosc));
            label2.Text = "Jasność obrazu: " + (int)jasnosc + "%";

            // kontrast
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);
                    int avg = (pixel.R + pixel.G + pixel.B) / 3;
                    tmpkont = tmpkont + ((avg - jasnosc) * (avg - jasnosc));

                }
            label2.Text = "Jasność obrazu: " + (int)jasnosc + "%";

            kontrast = System.Math.Sqrt(tmpkont / (L * K));
            kontrast = (100 * kontrast / 127);
            label3.Text = "Kontrast obrazu: " + (int)kontrast + "%";
            SetBitMap(ref m_ekran);
        }

        public void scroll_jasnosc()
        {
            int offset = hScrollBar1.Value;
            int Red = 0;
            int Green = 0;
            int Blue = 0;
            double avg, sum = 0, jasnosc, tmpjasn = 0, kontrast, tmpkont = 0;

            System.Drawing.Color pixel;

            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);

                    Red = pixel.R + offset;

                    if (Red > 255) Red = 255;
                    else if (Red < 0) Red = 0;

                    Green = pixel.G + offset;

                    if (Green > 255) Green = 255;
                    else if (Green < 0) Green = 0;

                    Blue = pixel.B + offset;

                    if (Blue > 255) Blue = 255;
                    else if (Blue < 0) Blue = 0;

                    pixel = System.Drawing.Color.FromArgb(Red, Green, Blue);


                    m_ekran.SetPixel(i - 1, j - 1, pixel);
                    avg = (Red + Green + Blue) / 3;
                    sum += avg;

                }
            //jasnosc obrazu
            jasnosc = sum / (L * K);
            tmpjasn = (jasnosc * 100) / 255 + 0.996;
            label2.Text = "Jasność obrazu " + (int)tmpjasn + "%";

            // kontrast obrazu
            for (int j = 1; j <= L; j++)
                for (int i = 1; i <= K; i++)
                {
                    pixel = m_obraz_w_pamieci.GetPixel(i - 1, j - 1);
                    Red = pixel.R + offset;

                    if (Red > 255) Red = 255;
                    else if (Red < 0) Red = 0;

                    Green = pixel.G + offset;

                    if (Green > 255) Green = 255;
                    else if (Green < 0) Green = 0;

                    Blue = pixel.B + offset;

                    if (Blue > 255) Blue = 255;
                    else if (Blue < 0) Blue = 0;

                    avg = (Red + Green + Blue) / 3;
                    tmpkont = tmpkont + ((avg - jasnosc) * (avg - jasnosc));

                }

            kontrast = System.Math.Sqrt(tmpkont / (L * K));
            kontrast = (kontrast * 100 / 127);

            label3.Text = "Kontrast obrazu " + (int)kontrast + "%";

            SetBitMap(ref m_ekran);
        }