For devices that support image enhancement filtering. This capability selects the algorithm used to improve the quality of the image.
TWIF_LOWPASS is good for halftone images. TWIF_BANDPASS is good for improving text. TWIF_HIGHPASS is good for improving fine lines.
Integer
TWIF_NONE(0)
TWIF_NONE(0), TWIF_AUTO(1), TWIF_LOWPASS(2), TWIF_BANDPASS(3), TWIF_HIGHPASS(4)
TW_ENUMERATION, TW_ONEVALUE