Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 166

This is a Lift operation, which is covered later in this chapter. Your white point is
locked, while everything else changes—the opposite of Multiply.
RolloffContrast has one other property you can see in the I/O graph. This prop-
erty, called Soft Clip, is the property that gives this node its name. This property
smooths out the edges of the curve so that colors don't all of a sudden turn to
black or white and result in a harsh transition.
16. Move the center slider to 0.5and start to increase the Soft Clip slider.Istopped at
0.55.
FIGURE 4.17 shows what happens when you increase the soft clip. This creates a
much more appealing result, which is unique to this node.
Figure 4.17. This smooth edge to the curve is what gives RolloffContrast its
name.
Ifyouhaveafairamount ofexperience, youmusthavenoticed that theI/Ograph
looksalotlikeatoolyoumayhaveusedinthepast—somethingapplicationssuch
as Adobe After Effects call Curves. In Nuke, this is called ColorLookup, and it is
discussed in the next section.