Y Lift
Adjust the contrast of the image in the darker areas, specifically in the Y (luminance) channel only. This adjustment is great for a changing the black point without changing saturation.
Y Gamma
Adjust the contrast of the image in the mid-tone areas, specifically in the Y (luminance) channel only. This control helps add depth to shots, along with extra vibrancy.
Y Gain
Adjust the contrast of the image in the brighter areas, specifically in the Y (luminance) channel only. You can reduce hot shots or pull the whites to make the shot look more angelic!