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What are the differences between TWAIN and WIA

WIA refers to Windows Image Acquisition, which is the still image acquisition platform in the Windows family that enables imaging/graphics applications to interact with imaging hardware and standardizes the interaction between different applications and scanners.

WIA devices can be used by TWAIN applications like DWT through a TWAIN compatibility layer. This means WIA is not supported natively; therefore, when a device supports both TWAIN and WIA , TWAIN is the better option.

By comparison, WIA can only control a very limited set of general capabilities of the devices while TWAIN can control all standard and even custom capabilities of the devices. Another thing is that TWAIN has three transfer modes (Native, Memory, File), while WIA only has two (Memory, File).

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