The Sky Filter tool emulates the look of a polarizer on a blue or partially blue sky. The digital version doesn't control reflections but does add saturation and contrast to a sky.

Tint: Determines the relative amount of blue or green in the sky color.

Strength: Specifies the extent to which the effect is applied where 0 produces no result and 100% causes a strong blue tint.

Exposure Compensation: Corrects for any resulting changes in overall exposure.