Image grayscale method for C# digital image processing

//Define image grayscale functionprivate static Bitmap PGray(Bitmap src)
{
  int w = ;
  int h = ;
//Build a template image with the same size as the original image  Bitmap dstBitmap = new Bitmap(, , .Format24bppRgb);
//Storing the original image into memory   srcData = (new Rectangle(0, 0, w, h), , .Format24bppRgb);
   dstData = (new Rectangle(0, 0, w, h), , .Format24bppRgb);
  unsafe
  {
 byte* pIn = (byte*)srcData.();
 byte* pOut = (byte*)dstData.();
 byte* p;
 int stride = ;
 int r, g, b;
 for (int y = 0; y < h; y++)
 {
   for (int x = 0; x < w; x++)
   {
 p = pIn;
 r = p[2];
 g = p[1];
 b = p[0];
//Calling the image grayscale formula pOut[0] = pOut[1] = pOut[2] = (byte)(b * 0.114 + g * 0.587 + r * 0.299);  
 pIn += 3;
 pOut += 3;
   }
   pIn +=  - w * 3;
   pOut +=  - w * 3;
 }
 (srcData);
 (dstData);
 return dstBitmap;
  }
}