Apple Shake 4 - Manual (Page 667)

Chapter 23 Color Correction 667
To control the mask areas, turn on the Ranges curve display at the bottom of the Range
Curves tab. The left image below shows the default ranges. A curve of the final lookup
is displayed in this illustration as a yellow line for clarity. Notice that the Low and High
range curves’ (gray curves sloping in from left and right) centers are set at .5. If you
adjust the low or high values, you modify that range, as well as the mid-range curve.
For example, the second image shows what happens when low is set down to .1. Notice
the Low and Mid curves shift left, but the High curve remains unaffected.
The Curves Tab
The Curves tab allows you to apply manual modifications to the lookup curve.
Although this is generally used for manual adjustments, you can also apply functions
using the standard lookup expressions.
Note: To insert a new control point, Shift-click a segment of the curve.