C＃位图通过执行XOR更改像素颜色

Question

我尝试使用RGB的XOR更改RGB颜色。
例如：
=＆GT;如果某个像素上的R值为5 = 101左右//颜色pcolor = image.GetPixel（j，k）;

=＆GT;然后用一些字节101 ^ 11111111 = 11111010执行XOR // R [x，w] =（byte）（R [x，w] ^ mykey [0]）;

=＆GT;并将R替换为R = 11111010 = 250
//image.SetPixel（y，z，Color.FromArgb（A [y，z]，R [y，z]，G [y，z]，B [y，z]））;

但问题是如果我再次读取结果框架，我之前更改的R值不是250。

using Accord.Video.FFMPEG;

VideoFileReader reader = new VideoFileReader();
reader.Open(@"E:\Video\Sample.MP4");
VideoFileWriter writer = new VideoFileWriter();
writer.Open(@"E:\Video\Result.MP4", reader.Width, reader.Height, reader.FrameRate, VideoCodec.MPEG4);
MyFunc(reader, writer)

public static void Myfunc(VideoFileReader reader, VideoFileWriter writer)
    {
    byte[] mykey = { 0xff, 0x55, 0x00 };
    Bitmap image = new Bitmap(reader.Width, reader.Height, PixelFormat.Format24bppRgb);
    for (int i = 0; i<reader.FrameCount; i++)
    {
        Bitmap videoFrame = reader.ReadVideoFrame();
        image = videoFrame;
        byte[,] A = new byte[reader.Width, reader.Height];
        byte[,] R = new byte[reader.Width, reader.Height];
        byte[,] G = new byte[reader.Width, reader.Height];
        byte[,] B = new byte[reader.Width, reader.Height];
        for (int j = 0; j<reader.Width; j++)
        {
            for (int k = 0; k<reader.Height; k++)
            {
                Color pcolor = image.GetPixel(j, k);
                A[j, k] = pcolor.A;
                R[j, k] = pcolor.R;
                G[j, k] = pcolor.G;
                B[j, k] = pcolor.B;
            }
        }

        for (int x = 0; x<reader.Width; x++)
        {
            for (int w = 0; w<reader.Height; w++)
            {
                R[x, w] = (byte) (R[x, w] ^ mykey[0]);
                G[x, w] = (byte) (G[x, w] ^ mykey[0]);
                B[x, w] = (byte) (B[x, w] ^ mykey[0]);
           }
        }

        for (int y = 0; y<reader.Width; y++)
        {
            for (int z = 0; z<reader.Height; z++)
            {
                image.SetPixel(y, z, Color.FromArgb(A[y, z], R[y, z], G[y, z], B[y, z]));
            }
        }

        writer.WriteVideoFrame(image);
        videoFrame.Dispose();
    }
}