EncoderParameters encoderParams = new EncoderParameters(1);
EncoderParameter param = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100);
encoderParams.Param[0] = param;
ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders()[1];
emptyBmp.Save("D:\\111.jpg", codec, encoderParams);
emptyBmp.Dispose();