HOW TO: Convert Faxes Embedded in PDF to TIF

#1 Posted : Thursday, June 7, 2018 9:55:09 AM(UTC)

Christopher Thompson

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:
Leadtools.dll
Leadtools.Codecs.dll
Leadtools.Codecs.Tif.dll
Leadtools.Pdf

C#

Code:

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";
            try
            {
                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)
            {
                Console.WriteLine(ex.ToString());
            }
            finally
            {
                Console.ReadLine();
            }
        }
    }
}

File Attachment(s):

convertFaxEmbeddedInPdfToTiff_20.zip (347kb) downloaded 170 time(s).

Chris Thompson
Developer Support Engineer
LEAD Technologies, Inc.


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HOW TO: Convert Faxes Embedded in PDF to TIF