Additional Information
In 2002, Microsoft released the Windows Image Acquisition Automation Library Tool, which provides access to WIA functionality through programming languages and scripting environments that support OLE Automation.
In Windows XP, WIA runs in the LocalSystem context. Because of the security ramifications of running a service as LocalSystem whereby a buggy driver or malicious person would have unrestricted access to the system, the WIA service in Windows Server 2003 and Windows Vista operates in the LocalService context. This can result in compatibility issues when using a driver designed for Windows XP.
In Windows XP, support was added for automatic document feeder scanners, scroll-feed scanners without preview capabilities and multi-page TIFF generation. For WIA video, a snapshot filter driver is introduced that allows still frames to be captured from the video stream.
Windows Vista has the WIA Automation library built-in. Also, WIA supports push scanning and multi-image scanning. Push scanning allows initiating scans and adjusting scanning parameters directly from the scanner control panel. Multi-image scanning allows one to scan several images at once and save them directly as separate files. However, video content support is removed from WIA for Windows Vista. Microsoft recommends using the newer Windows Portable Devices API.
Read more about this topic: Windows Image Acquisition
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