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public const int MAX_THUMBNAIL_WIDTH = 256;
        public const int MAX_THUMBNAIL_HEIGHT = 256;
        public const String THUMBNAIL_FORMAT = ".jpg";
// Load into ImageMagick image
                Stream byteStream = new MemoryStream(asset.AssetData); //asset.AssetData is a byte array representing the file
                try
                {
                    MagickNet.Image image = new Image(byteStream);
                    // If the current image is small, don't enlarge it.
                    int newWidth = Math.Min(image.Size.Width, MAX_THUMBNAIL_WIDTH);
                    int newHeight = Math.Min(image.Size.Height, MAX_THUMBNAIL_HEIGHT);
                    
                    Blob thumbnail = new Blob();
                    if (fileExtension.Equals("psd"))
                    {
                        // Photoshop file must be converted before it's resized
                        image.Write(thumbnail, "JPG");
                        image = new Image(thumbnail);
                    }

                    // Resize to thumbnail, then save to thumbnail format
                    image.Resize(new Geometry(newWidth, newHeight));
                    image.Density = new MagickNet.Image.Resolution(72.0, 72.0);
                    image.Write(thumbnail, "JPG");

                    // Save blob back into Asset object
                    asset.PreviewThumbnail = thumbnail.ToArray();
                }