将图片PixelFormat其它格式转为Format32bppArgb格式

    // 将图片PixelFormat其它格式转为Format32bppArgb格式
   void ToFormat32bppArgb(byte []bs, string path)
    {
      MemoryStream ms = new MemoryStream(bs);
      Image imgr = Image.FromStream(ms);
      Bitmap bmp = new Bitmap(imgr.Width, imgr.Height, PixelFormat.Format32bppArgb);
      Graphics g = Graphics.FromImage(bmp);
      g.DrawImage(imgr, new Point(0,0));
      g.Dispose();
      bmp.Save(path);
    }