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 2.1, released on July 8, 2009. TWAIN 2.1 features include support for MICR, PDF/A, automatic image rotation, infrared pixel type, auto-sized images, automatic color detection, and automatic selection between feeder and flatbed.