Apple Color 1.0 - Manual (Page 217)

Chapter 10 Secondaries 217
To make a symmetric adjustment to the Range handles:
m Drag the Range handles directly, or drag anywhere between the Range and Tolerance
handles (if the tolerance is wide enough) to widen or narrow the Range.
To make an asymmetric adjustment to the Range handles:
m Hold the Shift key down and drag the handle you want to adjust, while the opposing
handle remains fixed in place.
When you make an asymmetric adjustment, the center point also readjusts to match
the new range.
Note: You cannot make asymmetric adjustments using knobs on a control surface.
To adjust the Tolerance handles:
m Drag anywhere outside of the Center, Range, and Tolerance handles to widen or narrow
the tolerance.
You can also make asymmetric adjustments to tolerance by holding the Shift key while
dragging.