C#

Document document = new Document(PageSize.A4.Rotate());
       try
       {
           PdfWriter.GetInstance(document, new FileStream(outputPath, FileMode.Create));
           document.Open();
           for (int i = 0; i < list.Count; i++)
           {
               iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(list[i]);
               // Querformat
               if (img.Width >= img.Height)
               {
                   img.Alignment = iTextSharp.text.Image.MIDDLE_ALIGN;
                   //img.Alignment = iTextSharp.text.Image.ALIGN_TOP;
                   img.RotationDegrees = 0f;
               }
               // Hochformat
               else
               {
                   img.Alignment = iTextSharp.text.Image.MIDDLE_ALIGN;
                   //img.Alignment = iTextSharp.text.Image.ALIGN_TOP;
                   img.RotationDegrees = 270;
               }
               //img.ScaleToFit(624.5f, 462);
               //img.ScaleToFit(687, 508);
               //img.ScaleToFit(720, 534);
               img.ScaleToFit(855, 550);
               document.Add(img);
               //Add a new Page for net next image
               document.NewPage();
           }
          // document.Close();
       }
       catch (System.Exception EX)
       {
           logger.Error(EX.ToString());
       }
       finally
       {
           document.Close();
       }