gistfile1.cs

                    using (var imageFactory = new ImageFactory())
                    {
                        var layer = new ResizeLayer(new Size(800, 500), null, ResizeMode.Stretch);

                        imageFactory.Load(ms)
                            .Resize(layer)
                            .Format(ImageFormat.Jpeg)
                            .Quality(90)
                            .Save(path);
                    }