Duplex Scanning Support

A duplex scanner allows you to acquire images on both sides of the paper without the need to manually "flip" the paper.  The DTWAIN API includes functions that directly support duplex scanning.  This includes turning on/off duplex scanning mode, as well as querying the TWAIN Source as to whether duplex mode is supported, and the type of duplex device that is supported (one pass or two pass duplex mode).

If the scanner is a simplex scanner (the scanner scans one side only), DTWAIN has a manual duplex scanning mode This mode allows you to scan one side of a set of documents, and then scan the other side.  When both sides are done, the images are saved in a single multi-page image file (either TIFF, PDF, Postscript, or DCX file fomats).  There is no need for the user to reorder the pages -- DTWAIN does all of this work automatically.