public static IElement AddImage(string filePath)
 {
     var image = Image.GetInstance(filePath);
         var imgRaw = new ImgRaw(image);
         imgRaw.Alignment = Image.ALIGN_CENTER;
         imgRaw.ScaleToFit(PageSize.A4.Width - (PageSize.A4.Width * 0.15f), PageSize.A4.Height);
         return imgRaw;
 }