public void Zmien_Kontrast()
        {
            int red, green, blue;
            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;
                    green = pixel.G;
                    blue = pixel.B;
                    //--------------------------------------//
                    //miejsce na kod dokonujący zmianę obrazu
                    if (pixel.R > 127)
                    {
                        red = (int)(pixel.R + (pixel.R*KontrastUpDown.Value/100)); if (red > 255) red = 255;
                    }
                    if (pixel.R < 127)
                    {
                        red = (int)(pixel.R - (pixel.R * KontrastUpDown.Value / 100)); if (red > 255) red = 255;
                    }
                    if (pixel.G > 127)
                    {
                        green = (int)(pixel.G + (pixel.G * KontrastUpDown.Value / 100)); if (green > 255) green = 255;
                    }
                    if (pixel.G < 127)
                    {
                        green = (int)(pixel.G - (pixel.G * KontrastUpDown.Value / 100)); if (green > 255) green = 255;
                    }
                    if (pixel.B > 127)
                    {
                        blue = (int)(pixel.B + (pixel.B * KontrastUpDown.Value / 100)); if (blue > 255) blue = 255;
                    }
                    if (pixel.B < 127)
                    {
                        blue = (int)(pixel.B - (pixel.B * KontrastUpDown.Value / 100)); if (blue > 255) blue = 255;
                    }

                    pixel = System.Drawing.Color.FromArgb(red, green, blue);

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

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


        }