TWAIN is an (API) and that regulates communication between and devices, such as and .
TWAIN isn't a hardware-level protocol; it requires a driver called Data Source for each device.
The design of TWAIN began in January 1991. The TWAIN group originally launched in 1992 by several members of the imaging industry, with the intention of standardising communication between image handling software and hardware. Review of the original TWAIN Developer’s Toolkit occurred from April, 1991 through January, 1992.
The word TWAIN isn't officially an , but it is a . The official website notes that "the word TWAIN is from 's — '...and never the twain shall meet...' — reflecting the difficulty, at the time, of connecting scanners and . It was up-cased to TWAIN to make it more distinctive. This led people to believe it was an acronym, 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." For example, the Encyclopedia of Information Technology lists "Technology Without an Interesting Name" as the official meaning of TWAIN.
|1.6||5 February 1996|
|1.7||19 August 1997|
|1.8||22 October 1998|
|1.9||20 January 2000|
|2.0||22 February 2008|
|2.1||8 July 2009|
|2.2||16 February 2012|
|2.3||21 November 2013|
Objectives of the TWAIN Working Group and standard include:
- 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 platforms including , , , and
TWAIN Working Group membership
Today the TWAIN standard, including the specification, data source manager and sample code, are maintained by the organisation TWAIN Working Group.
Board and associate members of the TWAIN Working Group include:
- Atalasoft, a company
- Computer Products of America
- Spike Labs