Apple Shake 4 - Manual (Page 969)

Chapter 32 The Cookbook 969
In this next attempt, there are three main branches. The first, identical to the second
attempt, manipulates the moon. The second branch, terminating in a KeyMix node,
works on the RGB of the clouds. The KeyMix mixes a darkened cloud image with a
brighter cloud image through the RGrad node, giving it the “glow” through the clouds.
The third branch works on the key of the clouds. This is divided into two sub-branches,
one of which pulls a soft key on the clouds, and the second of which pulls a hard key to
act as a garbage mask.
Move2D1 KeyMix1