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TWAIN was developed by a consortium of software and hardware manufacturers to standardize the communications between applications programs and image acquisition devices. The interface is optimized for the acquisition of graphics images. The TWAIN standard is widely supported by scanner manufacturers, with most users of TWAIN version 1.8. ImageGear supports all three TWAIN Transfer Modes: Native Data Transfer Mode (which is the TWAIN default), Disk File Transfer, and Buffered Memory.

A TWAIN-compliant image acquisition device is one whose device driver complies with TWAIN specifications. The device driver understands the TWAIN protocol, thus allowing interaction with the Data Source Manager, the main interface module of the TWAIN software. The Data Source Manager "manages the session" between the application program and the raster-generating data source. Three software elements work together in TWAIN: the application (where IGTwainCtl Control is the component that actually talks to TWAIN), the Data Source (DS), and the Data Source Manager (DSM).

The following terminology is used to discuss ImageGear scanning:

• Data Source: This is a piece of software provided by the manufacturer of the device. Windows will refer to this as a "Device Driver". It must be installed in the system where your application program will run.
• Data Source Manager: This is the TWAIN manager for the device drivers. This is a piece of software developed by the TWAIN consortium, to provide a common mechanism for managing and using the Data Sources from all the different device manufacturers. It must be installed in the system where your application will run.
• Device: This term covers all devices from which images can be acquired using the TWAIN protocol, including scanners and cameras.

See the section Using ImageGear TWAIN Component to learn how to use TWAIN Component API for scanning images.

 

 

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