Why Capability Negotiation
One of TWAIN's benefits is that it allows applications to easily interact with a variety of acquisition devices.
Different devices may have different
capabilities. For instance,
Some devices have automatic document feeders.
Some devices are not limited to one image but can transfer multiple images.
Some devices support color images.
Some devices offer a variety of halftone patterns.
Some devices support a range of resolutions while others may offer different choices.
With capability negotiation, developers can make applications act
accordingly.