oprava

pixel = img.getRGB(x, y);
                R = (pixel & 0x00ff0000) >> 16;
                G = (pixel & 0x0000ff00) >> 8;
                B = (pixel & 0x000000ff);
                it = (float)(0.299*R + 0.587*G + 0.114*B);
                i = Math.round(it);
                R = i >> 16;
                G = i >> 8;
                B = i;
                novy = R|G|B;
                img.setRGB(x, y, novy);