TWAIN is a standard software protocol and applications programming interface (API) that regulates communication between software applications and imaging devices such as scanners and digital cameras.

The latest version of the TWAIN standard is TWAIN 2.2, released on February 16, 2012. TWAIN 2.2 features include Self-Certification and the white papers for Mandatory Features and Capability Ordering incorporated into the body of the TWAIN Specification. Data Sources advertise the DG / DAT operations they support. A single chapter defines the entire symbolic and numeric space for the TWAIN 2.2 Specification. Constraining a capability is now distinct from the ability to get, set and reset its current value. References the Sample Code for Applications and Data Sources. New definitions added for multiple color dropout, double document detection, negotiable image segments, greater control of warning and error dialogs from the data source, paper handling, printing and the ability to detect both busy and locked data sources. TWAIN Working Group.

Read more about TWAIN:  History, Vision Statement, Objectives, Supported Technologies, TWAIN Working Group Membership

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