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 is the better option.
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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