C# Bitmap객체를 8bit gray로 byte array에 담기

맞는지 검증은 차차하기로...-_-;

 

 

 

        public static byte[] ToGrayscale(Bitmap bmp)
        {

            int bpp = Image.GetPixelFormatSize(bmp.PixelFormat) / 8;

            BitmapData src_data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.WriteOnly, bmp.PixelFormat);

            byte[] src_bytes = new byte[src_data.Stride * src_data.Height];
            Marshal.Copy(src_data.Scan0, src_bytes, 0, src_bytes.Length);
            // Copy the bytes from the image into a byte array
            byte[] dst_bytes = new byte[bmp.Height * bmp.Width];

            for(int i=0; i<dst_bytes.Length; ++i)
                dst_bytes[i] = (byte)((src_bytes[i * bpp + 0] + src_bytes[i * bpp + 1] + src_bytes[i * bpp + 2]) / 3);

            bmp.UnlockBits(src_data);
#if DEBUG
/*
            Bitmap result = new Bitmap(bmp.Width, bmp.Height, PixelFormat.Format8bppIndexed);
            BitmapData dst_data = result.LockBits(new Rectangle(0, 0, result.Width, result.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
            Marshal.Copy(dst_bytes, 0, dst_data.Scan0, dst_bytes.Length);
            result.UnlockBits(dst_data);
            ColorPalette Palette = result.Palette;
            for (int i = 0; i < Palette.Entries.Length; ++i)
            {
                Palette.Entries[i] = Color.FromArgb(i, i, i);
            }
            result.Palette = Palette;

            result.Save("dst.jpg");
//*/
#endif


            return dst_bytes;
        }