Converting Tiff to pdf in c#

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.NET

PDF

C#5.0

TIFF

Hello

i am trying to convert multiple tiff images to single pdf file. i went through this link
atashbahar.com.

i Have done the following coding refering to above link

iTextSharp.text.Document document = new iTextSharp.text.Document(new RectangleReadOnly(842,595), 0, 0, 0, 0);


     iTextSharp.text.pdf.PdfWriter writer = iTextSharp.text.pdf.PdfWriter.GetInstance(document, new System.IO.FileStream(DestPath, System.IO.FileMode.Create));

     // load the tiff image and count the total pages
     System.Drawing.Bitmap bm = new System.Drawing.Bitmap(Source);
     int total = bm.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page);

     document.Open();
     iTextSharp.text.pdf.PdfContentByte cb = writer.DirectContent;
     for (int k = 0; k < total; ++k)
     {
         bm.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, k);
         iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(bm, System.Drawing.Imaging.ImageFormat.Bmp);


         img.ScalePercent(50f / img.DpiX * 100);
         img.SetAbsolutePosition(0, 0);
         cb.AddImage(img);
         document.NewPage();
     }
     document.Close();

i Want the page size to be A3. though the above code generates a pdf document, it is not printing the entire image on a page. the image is splitted and part of a image is only visible. i think the problem is with scalling. i googled for A3 scalling but all went in vain..

Any help will be appreceated..

thank you