Color Channel Extractor

    public enum Colors { Red, Green, Blue};

    public static class IMG
    {
        public static Bitmap GetColor(Bitmap src, Colors c)
        {
            int w = src.Width, h = src.Height;
            Bitmap ret = new Bitmap(w, h);

            for (int i = 0; i < w; ++i)
            for (int j = 0; j < h; ++j)
            {
                Color pixel = src.GetPixel(i, j);
                int r = 0, g = 0, b = 0;
                if (c == Colors.Red) r = pixel.R; 
                else if (c == Colors.Green) g = pixel.G;
                else if (c == Colors.Blue) b = pixel.B;

                ret.SetPixel(i, j, Color.FromArgb(r, g, b));
            }
            return ret;
        }