Touring the Interface with a Basic Composite - Nuke 101: Professional Compositing and Visual Effects - page 75

Using the Shuffle node
The Shuffle node is one of the most useful nodes in Nuke. A lot of times you need to
movechannelsaroundfromonelocationtoanother—takingthealphachannelandplacing
a copy of it in the three color channels, for example. Think of it as if you were moving a
piece of paper from one location in a stack to another location ( FIGURE 2.46 ).
Figure 2.46. The Shuffle node's anatomy.
TheShufflenodelookslikeamatrixbuiltfromasourceatthetoptothedestinationonthe
right. To understand the flow of the Shuffle node, follow the arrows from the In property
at the top till you reach the Out property on the right.