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Enormous Filesize When Converting Multipage TIFF to PDF

I am looking to convert TIFF files into PDF files. A single TIFF file can have multiple pages and I would want the resulting PDF to be a single file with multiple pages just like the TIFF. I have looked on the forum and found some articles but nothing that is exactly what I want.

I tested the conversion with this code and the resulting PDF was orders of magnitude larger in file size than the original TIFF. For example a 20MB TIFF came out to be a 700MB PDF!!

// The path to the documents directory.
string dataDir = @"C:\Users\10055\Desktop\ConsoleApp1";

// Get a list of tiff image files
string[] files = System.IO.Directory.GetFiles(dataDir, "*.tif");

Aspose.Pdf.License pdfLicense = new Aspose.Pdf.License();

// Instantiate a Document object
Aspose.Pdf.Document doc = new Aspose.Pdf.Document();

// Navigate through the files and them in the pdf file
foreach (string myFile in files)
    // Load all tiff files in byte array
    FileStream fs = new FileStream(myFile, FileMode.Open, FileAccess.Read);
    byte[] tmpBytes = new byte[fs.Length];
    fs.Read(tmpBytes, 0, Convert.ToInt32(fs.Length));

    MemoryStream mystream = new MemoryStream(tmpBytes);
    Bitmap b = new Bitmap(mystream);
    // Create a new Page in the Pdf document
    Aspose.Pdf.Page currpage = doc.Pages.Add();

    // Set margins so image will fit, etc.
    currpage.PageInfo.Margin.Top = 5;
    currpage.PageInfo.Margin.Bottom = 5;
    currpage.PageInfo.Margin.Left = 5;
    currpage.PageInfo.Margin.Right = 5;

    currpage.PageInfo.Width = (b.Width / b.HorizontalResolution) * 72;
    currpage.PageInfo.Height = (b.Height / b.VerticalResolution) * 72;

    // Create an image object
    Aspose.Pdf.Image image1 = new Aspose.Pdf.Image();

    // Add the image into paragraphs collection of the page

    // Set IsBlackWhite property to true for performance improvement
    //image1.IsBlackWhite = true;

    // Set the ImageStream to a MemoryStream object
    image1.ImageStream = mystream;
    // Set desired image scale
    image1.ImageScale = 0.95F;

    // Save the Pdf
    doc.Save(dataDir + $"\\{System.IO.Path.GetFileNameWithoutExtension(myFile)}_PerformaceImprovement_out.pdf");

I have both the Aspose PDF and Aspose Words products and open to a solution in either.


Thanks for your inquiry.

Would you kindly share your sample TIFF image with us. We will test the scenario in our environment and address it accordingly. Please note that in case your file is larger to upload within here, you may please upload it to Dropbox or Google Drive and share the link with us.