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

This enumeration specifies contrast adjustment modes.

Values:

IG_CONTRAST_PALETTE Alter image palette.
IG_CONTRAST_PIXEL Alter image pixels.
IG_CONTRAST_AUTO If the image is indexed, alter palette, otherwise alter pixels.