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#1 Posted : Thursday, August 17, 2006 4:56:26 AM(UTC)

Groups: Registered
Posts: 11

Are the LEADTOOLS components WIA compliant? What is the difference between the two?


Edited by moderator Tuesday, October 4, 2016 4:34:25 PM(UTC)  | Reason: Not specified


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#2 Posted : Friday, August 18, 2006 11:20:52 AM(UTC)


Groups: Registered, Tech Support, Administrators
Posts: 764

There are many similarities between TWAIN and WIA, but there are also some distinct differences that you should base your choice on when developing an application.


  • As long as a driver exists, both are able to acquire images from devices such as a scanner or camera. For devices like cameras, sometimes the driver is actually WIA, but you can access it via the "TWAIN compatibility layer".
  • Acquire images with a dialog.
  • Programmatically set properties of the device and acquire the images programmatically without showing a dialog.
  • Not all capabilities are supported by each device, so you can query the device for the ones it does support.


  • TWAIN is better designed to use automatic document feeders (ADF). WIA does not have a robust API to use ADF, which limits its usage to flatbed scanners and cameras.
  • In general, when a device supports both TWAIN and WIA, TWAIN is better for scanners and WIA is better for acquiring images from still cameras and video devices.
  • WIA uses a common dialog for all devices, while TWAIN uses a dialog created by the device manufacturer. Practically speaking, this almost always means that the TWAIN dialog will provide more options and advanced control over the device.
  • TWAIN allows you to use custom capabilities that the device manufacturer has created even though they do not exist in the TWAIN specification.
  • TWAIN has three transfer modes (Native, Memory, File) and WIA only has two (Memory, File).
  • Most TWAIN sources save the settings of the previous scan, while WIA does not.
  • TWAIN supports options for each page when scanning in duplex mode, but WIA uses the same settings for both sides.

In a nutshell, we recommend to use TWAIN to capture from a scanner and WIA to capture from a camera.

For more details about WIA, please visit http://www.microsoft.com/whdc/device/stillimage/WIA-arch.mspx

For more details about TWAIN, please visit http://www.twain.org/

LEADTOOLS provides full support for TWAIN 2.0 and WIA in the Imaging Pro toolkit and better. For more information and a free evaluation, please visit:

Once you have downloaded and installed LEADTOOLS, there are some demos you can review as well:

  • <LEADTOOLS Install Folder>\Examples\DotNet\CS\WiaDemo
  • <LEADTOOLS Install Folder>\Examples\DotNet\CS\TwainDemo


  • <LEADTOOLS Install Folder>\Examples\CDLL\WiaDemo
  • <LEADTOOLS Install Folder>\Examples\CDLL\Twain

Edited by moderator Tuesday, November 29, 2016 12:16:51 PM(UTC)  | Reason: Added new difference

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