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#1 Posted : Thursday, December 12, 2019 3:46:51 PM(UTC)


Groups: Registered
Posts: 22

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 following image is displayed pixel for pixel from image to screen which assumes that the image's pixel aspect ratio (2:1) matches the screen's pixel aspect ratio (1:1). This results in an image that is displayed squashed with half the height it should have when displayed correctly.

Incorrectly Displayed Fax Image

In this example, we load a fax that is embedded in a PDF file and save it as a TIFF. During the process, we ensure that the X and Y resolution of the resulting TIFF matches the that of the FAX in the PDF.

File Attachment(s):
ConvertPdfToTif.zip (5kb) downloaded 74 time(s).

Edited by moderator Monday, March 2, 2020 2:09:03 PM(UTC)  | Reason: Not specified

Robbey Rodriguez
Developer Support Engineer
LEAD Technologies, Inc.
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#2 Posted : Tuesday, March 24, 2020 12:14:12 PM(UTC)
Luke Duvall

Groups: Registered, Tech Support, Administrators
Posts: 34

Updated Project to LEADTOOLS Version 20 using Visual Studio 2019

Make sure to unzip this project into "C:\LEADTOOLS 20\Examples\DotNet\GitHub" to test. If you do not have a GitHub folder, create one and then unzip the project inside the folder.

File Attachment(s):
ConvertPdfToTif.zip (77kb) downloaded 77 time(s).
Luke Duvall
Developer Support Engineer
LEAD Technologies, Inc.
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