Accord.Imaging.Filters.RGChromacity.ProcessFilter C# (CSharp) Method

        protected unsafe override void ProcessFilter(UnmanagedImage image)
        {
            int width = image.Width;
            int height = image.Height;

            int pixelSize = System.Drawing.Image.GetPixelFormatSize(image.PixelFormat) / 8;
            int stride = image.Stride;
            int offset = stride - image.Width * pixelSize;

            byte* src = (byte*)image.ImageData.ToPointer();

            for (int y = 0; y < height; y++)
            {
                for (int x = 0; x < width; x++, src += pixelSize)
                {
                    double sum = src[RGB.R] + src[RGB.G] + src[RGB.B];
                    sum = sum == 0 ? 1 : sum;

                    double red = src[RGB.R] / sum;
                    double green = src[RGB.G] / sum;
                    double blue = 1 - red - green;

                    src[RGB.R] = (byte)(red * 255);
                    src[RGB.G] = (byte)(green * 255);
                    src[RGB.B] = (byte)(blue * 255);
                }
                src += offset;
            }
        }
    }