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Original author(s)TWAIN Working Group
Developer(s)TWAIN Working Group
Initial releaseFebruary 1992; 28 years ago
Stable release2.4 (11 December 2015; 4 years ago) [±][1]
Operating systemLinux, macOS, Microsoft Windows
Platformx86, x86-64, PowerPC
TypeApplication programming interface
LicenseLGPL (Data Source Manager only)

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TWAIN and TWAIN Direct are application programming interfaces (APIs) and communication protocols that regulate communication between software and digital imaging devices, such as image scanners and digital cameras. TWAIN is supported on Microsoft Windows, Linux and Mac OS X[2].

The three key elements of TWAIN are[2]:

In Dynamic Web TWAIN, there is a property named ImageCaptureDriverType which only works for Mac Edition. When the value of this property is set to 3, it will use an ICA driver for scanning images from scanners. Nikon super coolscan 4000 manual. In order to know whether your scanners have ICA drivers or not, you can use the built-in application Preview to have a test. Dynamic Web TWAIN is a TWAIN-based scanning SDK specifically designed for web applications. It provides HTML5 / JS TWAIN libraries. With it, you can easily create scanning software that is compatible with all mainstream browsers on Windows and Mac OS X. Try an online demo – web scanning on Mac. You can access the online demo to try scanning. Aug 23, 2019  TWAIN SANE is a TWAIN datasource for Mac OS X that acquires images using the SANE backend libraries. The SANE backend libraries provide access to a large range of scanners connected through SCSI or USB. For a complete list see the documentation on the SANE project homepage.It works with my HP SCSI scanner, and many people have reported success with a large number of different.

  • Application software. For example, graphics software, a fax application or a word processor.
  • Source manager software. The source manager software is a software library provided by the TWAIN Working Group.
  • Device drivers (referred to as 'Source software' in the specification document)

Both the application and the device driver must support TWAIN for the interface to be successfully used.


The design of TWAIN began in January 1991. The TWAIN group was originally launched in 1992 by several members of the imaging industry, with the intention of standardizing communication between image handling software and hardware.[3] Review of the original TWAIN Developer's Toolkit occurred from April, 1991 through January, 1992.[4]

The word TWAIN is not officially an acronym, but it is a backronym. The official website notes that 'the word TWAIN is from Kipling's 'The Ballad of East and West' — '..and never the twain shall meet..' — reflecting the difficulty, at the time, of connecting scanners and personal computers. It was up-cased to TWAIN to make it more distinctive. This led people to believe it was an acronym,[5] and then to a contest to come up with an expansion. None was selected, but the entry Technology Without an Interesting Name continues to haunt the standard.'[6][7] For example, the Encyclopedia of Information Technology lists 'Technology Without an Interesting Name' as the official meaning of TWAIN.[8]

Release history of the TWAIN API[9]
VersionRelease dateChanges
1.0February 1992
  • Initial release
1.5May 1993
  • Performance enhancements
1.65 February 1996
  • Page-length detection
  • Buffer transfer
1.719 August 1997
  • Production scanning features
1.822 October 1998
  • Production scanning features omitted from v1.7 of the TWAIN specification
  • Support for barcode and patch code control
1.920 January 2000
  • Support for the Cocoa software development API in Mac OS X
2.022 February 2008
  • Linux support
  • Support for the Win64 version of the Windows API
  • New open-source Data Source Manager, licensed under the LGPL
  • Support for cheque-scanning
2.18 July 2009
  • Support for Windows 7 (32- and 64-bit)
  • Support for automatic color detection
2.216 February 2012
  • Implemented self-certification and new mandatory features
2.321 November 2013
  • Improved clarity and removed ambiguity.
2.415 December 2015
  • Improved clarity and removed ambiguity


Objectives of the TWAIN Working Group and standard include:

Connect your device to your Mac. You can connect your device using a USB or USB-C cable or using a Wi-Fi connection. To turn on Wi-Fi syncing, see Sync content between your Mac and iPhone or iPad over Wi-Fi. In the Finder on your Mac, select the device in the Finder sidebar. Select a type of content you want to sync in the button bar. In the 'People' section, select Sync and Google services. Select Data from Chrome sync. At the bottom, select Reset sync. All the information that has been synced will be deleted from your Google Account. All of your bookmarks, apps, and extensions will stay on your Chromebook, but won't show up on other Chromebooks you use. If you want to sync more than one account or you share your computer with others, learn how to add a profile in Chrome. Turn off sync If you turn off sync, you can still see your bookmarks, history, passwords and other settings on your computer. My chrome apps won't sync to my mac account.

  • Ensure image-handling software and hardware compatibility
  • Keep the specification current with the state of current software and hardware while maintaining backward compatibility
  • Provide multiple-platform support
  • Maintain and distribute a no-charge developer's toolkit
  • Ensure ease of implementation
  • Encourage widespread adoption
  • Open Source Data Source Manager
  • LGPL Open Source License
  • BSD Open Source Sample Application and Sample Data Source Application

TWAIN provides support for:

  • Production, high-speed scanning
  • Multiple operating system platforms including Windows, classic Mac OS, macOS, and Linux

TWAIN Working Group[edit]

Today the TWAIN standard, including the specification, data source manager and sample code, are maintained by the not-for-profit organization TWAIN Working Group.

Board and associate members of the TWAIN Working Group include:

  • Atalasoft, a Kofax Company
  • Kodak Alaris
  • Fujitsu Computer Products of America
  • InoTec GmbH
  • ExactCODE GmbH
  • Microtek International, Inc.

See also[edit]

  • Image and Scanner Interface Specification (ISIS)

Twain Scanner Software


  1. ^'TWAIN Features'. FileZilla. 11 December 2017. Retrieved 14 October 2017.
  2. ^ ab'TWAIN Specification Version 2.4'(PDF). TWAIN Working Group. Retrieved 2 April 2020.
  3. ^What is the TWAIN Initiative?Archived March 8, 2012, at the Wayback Machine
  4. ^TWAIN docs indexArchived September 27, 2011, at the Wayback Machine
  5. ^Chambers, Mark L. (2010). PCs All-in-One For Dummies (5th ed.). John Wiley & Sons. p. 458. ISBN9780470908006.
  6. ^Pete Walsh; Francine Spiegel; Janee Aronoff (2013). Photoshop Elements 2 Most Wanted. Apress. p. 8. ISBN9781430251194.
  7. ^'The TWAIN Forum • View topic - What is TWAIN an acronym for?'. Archived from the original on April 2, 2016. Retrieved 2013-06-14.
  8. ^Encyclopedia of Information Technology. Atlantic Publishers & Dist. 2007. p. 501. ISBN978-8126907526.
  9. ^'TWAIN Features'. FileZilla. 11 December 2017. Retrieved 14 October 2017.


  • This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the 'relicensing' terms of the GFDL, version 1.3 or later.

External links[edit]

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