User Manual

HSL converts the image into Hue, Saturation, and Lightness channels. Lightness is
identical to Luminance, while Hue and Saturation are exactly as described.
LAB operates on the L, A, and B channels. The L channel governs luminance, while the
A and B channels are color difference channels; A adjusts color on an axis from
magenta to green, B adjusts color on an axis from yellow to blue.
Splitting Channels with the Splitter/
Combiner Nodes
Another method of applying corrections to individual color channels is using the Splitter/
Combiner nodes, which break the Red, Green, and Blue channels apart into separate node tree
branches, each capable of accepting multiple serial and parallel nodes of image adjustment.
There are two ways you can create a Splitter/Combiner node structure.
Methods of adding Splitter/Combiner nodes:
 To add a premade Splitter/Combiner node structure: Choose Color > Nodes > Add
Splitter/Combiner Nodes (Option-Y). A Splitter and Combiner node appear already
connected to three Corrector nodes, one for each color channel.
 To manually construct a Splitter/Combiner node structure: Right-click in any empty
area of the Node Editor, and choose from the Add Node submenu to create a Splitter
node, a Combiner node, and three Corrector nodes, wiring them together as necessary
to create the desired effect.
The Splitter Combiner node structure
The Splitter node takes an incoming image and provides individual outputs for each color
channel (top/red, middle/green, bottom/blue). When you connect each of these outputs to a
Corrector node, that color channel automatically connects to all three internal channels of that
node, so that the default three nodes in a Splitter/Combiner structure are internally processing
red/red/red, green/green/green, blue/blue/blue. The Combiner then pulls the Red, Green, and
Chapter – 127 Channel Splitting and Image Compositing 2881