gistfile1.cs

//Save 100 quality JPEG image in C#
var combinedImage = ImageCombiner.Combine(16, images);

var encoder = ImageCodecInfo.GetImageEncoders().FirstOrDefault(e => e.MimeType == "image/jpeg");
var encoderParams = new EncoderParameters();
encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

combinedImage.Save("wall_big.jpg", encoder, encoderParams);