Ask: how c # the 8-bit grayscale convert byte [] type?-CodePudding

I ask, how to put the 8-bit grayscale convert byte [] type ah, I use the following this code, the conversion of less to

I use the console output BMP PixelFormat, type of Format8bppIndexed

 
Public static byte [] GetByteData Bitmap (BMP) 
{
BitmapData bmpdata=https://bbs.csdn.net/topics/null; 
Bmpdata=https://bbs.csdn.net/topics/bmp.LockBits (new Rectangle (0, 0, BMP. Width, BMP, Height), ImageLockMode. ReadOnly, BMP. PixelFormat); 
Int numbytes=bmpdata. Stride * BMP. Height; 
Byte [] bytedata=https://bbs.csdn.net/topics/new byte [numbytes]; 
IntPtr PTR=bmpdata. Scan0; 

Marshal. Copy (PTR, bytedata, 0, numbytes); 

Return bytedata; 
}