The Grad Exposure tool applies exposure adjustment in a soft rectangular area with rotation and falloff controls.

Stops: With a 1.0 gamma, each positive stop doubles the amount of light, while each negative stop halves it.

X1, Y1, X2, Y2: Establishes the positions of the start and end of the gradient.

Falloff: Weights the gradient toward one end or the other of the gradient.

Color Balance: Tints the exposed regions.