ImageGear for C and C++ on Windows v19.10 - Updated
enumIGTWAINImageFilter
API Reference Guide > TWAIN Component API Reference > TWAIN Component Enumerations > enumIGTWAINImageFilter

This enumeration determines the algorithm used to improve the quality of the image.

Values:

IG_TW_IF_AUTO Auto.
IG_TW_IF_BANDPASS Bandpass algorithm. Good for improving text.
IG_TW_IF_FINELINE Fineline algorithm.
IG_TW_IF_HIGHPASS Highpass algorithm. Good for improving fine lines.
IG_TW_IF_LOWPASS Lowpass algorithm. Good for halftone images.
IG_TW_IF_NONE No algorithm
IG_TW_IF_TEXT Text algorithm.