AForge.Imaging.HSL.FromRGB C# (CSharp) Method

        public static HSL FromRGB( RGB rgb )
        {
            HSL hsl = new HSL( );
            FromRGB( rgb, hsl );
            return hsl;
        }

        private unsafe void ProcessImage(UnmanagedImage image)
        {
            this.CheckSourceFormat(image.PixelFormat);
            int width  = image.Width;
            int height = image.Height;

            this.pixels = this.pixelsWithoutBlack = 0;
            int[] numArray  = new int[0x100];
            int[] numArray2 = new int[0x100];
            int[] numArray3 = new int[0x100];
            int[] numArray4 = new int[0x100];
            RGB   rgb       = new RGB();
            HSL   hsl       = new HSL();
            int   num3      = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
            int   num4      = image.Stride - (width * num3);
            byte *numPtr    = (byte *)image.ImageData.ToPointer();

            for (int i = 0; i < height; i++)
            {
                int num6 = 0;
                while (num6 < width)
                {
                    rgb.Red   = numPtr[2];
                    rgb.Green = numPtr[1];
                    rgb.Blue  = numPtr[0];
                    HSL.FromRGB(rgb, hsl);
                    numArray[(int)(hsl.Saturation * 255.0)]++;
                    numArray2[(int)(hsl.Luminance * 255.0)]++;
                    this.pixels++;
                    if (hsl.Luminance != 0.0)
                    {
                        numArray3[(int)(hsl.Saturation * 255.0)]++;
                        numArray4[(int)(hsl.Luminance * 255.0)]++;
                        this.pixelsWithoutBlack++;
                    }
                    num6++;
                    numPtr += num3;
                }
                numPtr += num4;
            }
            this.saturation             = new ContinuousHistogram(numArray, new DoubleRange(0.0, 1.0));
            this.luminance              = new ContinuousHistogram(numArray2, new DoubleRange(0.0, 1.0));
            this.saturationWithoutBlack = new ContinuousHistogram(numArray3, new DoubleRange(0.0, 1.0));
            this.luminanceWithoutBlack  = new ContinuousHistogram(numArray4, new DoubleRange(0.0, 1.0));
        }