Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 167

Creating Curves with ColorLookup
The ColorLookup node mentioned at the beginning of this lesson is actually an I/O graph
you can control directly. This makes it the operation with the most amount of control.
However, it's actually the hardest to control and keyframe due to its more complicated
user interface. After all, it's easier to set a slider and keyframe it than move points on a
graph.
Let's try this node on both the image and the I/O graph itself.
1. Replace RolloffContrast2 with a ColorLookup node in the Color toolbox
( FIGURE 4.18 ) .
Figure 4.18. The ColorLookup interface.
The interface for this node has the narrow curves list on the left, and the curve
area on the right. Choosing a curve at left displays that curve at right, which en-