private void AddRow2() {
         var row = table.AddRow();
         row.Shading.Color = TableWhite;
         //row.HeightRule=RowHeightRule.Exactly;
         //row.Height = 680;

         var cellParagraph = row.Cells[0].AddParagraph();

         //the diagrampath points to a picture
         var image = cellParagraph.AddImage(viewModel.DiagramPath);

         //because image.width/height always = 0 I had to do this
         var imageScaling = CalculateImageScaling();

         if (imageScaling == null) { return; }
         image.ScaleHeight = imageScaling.Value;
         image.ScaleWidth = imageScaling.Value;
      }

      private double? CalculateImageScaling() {
         float horizontalResolution;
         float verticalResolution;

         //gets the users screen resolution
         using (var panel = new Panel()) {
            using (var g = panel.CreateGraphics()) {
               horizontalResolution = g.DpiX;
               verticalResolution = g.DpiY;
            }
         }
         //bring the image in as a GDI+ object
         var image = new Bitmap(viewModel.DiagramPath);

         //calculate the points size of the image
         var ptsWidth = image.Width * (72/horizontalResolution );
         var ptsHeight = image.Height * (72/verticalResolution);

         //do nothing if the image will fit in the cell
         if (ptsHeight < 680 && ptsWidth < 576 ) { return null; }

         //return the scalingFactor of the dimension that sticks out furthest
         // in points 576 is the cell width, 680 is the cell height
         var widthDiff = ptsWidth - 576;
         var heightDiff = ptsHeight - 680;
         if (heightDiff > widthDiff) { return 680 / ptsHeight ; }
         return 576 / ptsWidth ;
      }