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

This enumeration determines the orientation of images that flip orientation of every other image.

Values:

IG_TW_FR_BOOK The images to be scanned are viewed in book form, flipping each page from left to right or right to left.
IG_TW_FR_FANFOLD The images to be scanned are viewed in fanfold paper style, flipping each page up or down.