Welcome Guest! To enable all features, please Login or Register.



Last Go to last post Unread Go to first unread post
#1 Posted : Thursday, June 7, 2018 9:55:09 AM(UTC)

Groups: Registered, Tech Support, Administrators
Posts: 89

Was thanked: 4 time(s) in 4 post(s)

Updated from our LEADTOOLS Blog Post

Even today there are many organizations that rely on fax as a required form of communications. Because of this, receiving faxes is a requirement that much still be met. To do this, many organizations utilize fax services either hosted locally or by a third-party. Many of these services will email received faxes to users as a PDF file.

In a normal facsimile transmission, every other scan-line is skipped. This reduces the amount of data that needs to be sent over the relatively slow connection used to send faxes. To account for the missing scan-lines, the aspect ratio of the pixels is 2:1. It is important to recognize this when displaying the image else you will end up displaying the image incorrectly, making it looked squashed.

The code below utilizes the following DLLs:

using System;
using System.IO;

using Leadtools;
using Leadtools.Codecs;

namespace convertFaxEmbeddedInPdfToTiff_20
    class Program
        static void Main(string[] args)
            string licenseFilePath = @"C:\LEADTOOLS 20\Common\License\LEADTOOLS.LIC";
            string keyFileValue = File.ReadAllText(@"C:\LEADTOOLS 20\Common\License\LEADTOOLS.LIC.KEY");

            RasterSupport.SetLicense(licenseFilePath, keyFileValue);

            string srcFile = @"C:\Users\cthompson\Desktop\Fax.pdf";

            Func<int, string> getSaveFileName = pg => Path.GetDirectoryName(srcFile)
                     + Path.DirectorySeparatorChar
                     + Path.GetFileNameWithoutExtension(srcFile)
                     + "_pg"
                     + pg.ToString()
                     + ".tif";
                using (var codecs = new RasterCodecs())
                    var info = codecs.GetInformation(srcFile, true);
                    for (var pageNumber = 1; pageNumber <= info.TotalPages; pageNumber++)
                        // Make sure the resulting img has the original resolution
                        var pdfInfo = codecs.GetRasterPdfInfo(srcFile, pageNumber);
                        codecs.Options.RasterizeDocument.Load.XResolution = pdfInfo.XResolution;
                        codecs.Options.RasterizeDocument.Load.YResolution = pdfInfo.YResolution;

                        // Save the file using a format appropriate for the bits per pixel
                        var bpp = pdfInfo.BitsPerPixel;
                        var saveFormat = RasterImageFormat.Tif;

                        if (bpp == 1)
                            saveFormat = RasterImageFormat.CcittGroup4;
                        else if (bpp > 1 && bpp < 9)
                            saveFormat = RasterImageFormat.TifLzw;
                        else if (bpp == 24)
                            saveFormat = RasterImageFormat.TifJpeg;

                        using (var page = codecs.Load(srcFile, pageNumber))
                            codecs.Save(page, getSaveFileName(pageNumber), saveFormat, 0);
                Console.WriteLine("Operation Successful");
            catch (Exception ex)

File Attachment(s):
convertFaxEmbeddedInPdfToTiff_20.zip (347kb) downloaded 170 time(s).
Chris Thompson
Developer Support Engineer
LEAD Technologies, Inc.


Try the latest version of LEADTOOLS for free for 60 days by downloading the evaluation: https://www.leadtools.com/downloads

Wanna join the discussion? Login to your LEADTOOLS Support accountor Register a new forum account.

You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF.NET | YAF.NET © 2003-2024, Yet Another Forum.NET
This page was generated in 0.105 seconds.