Apple Color 1.5 - Manual (Page 267)

To adjust the Tolerance handles
µ
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 down the Shift key
while dragging.
The Color Swatches
A set of six swatches underneath the HSL qualifiers lets you automatically set the Hue
qualifier to a narrow range that’s centered on one of the primary red, green, and blue,
and secondary cyan, magenta, and yellow colors.
The swatches can be useful when you need to quickly make a hue selection for a feature
in the image that corresponds to one of these colors. When you choose one of these
swatches, the Saturation and Lightness controls remain completely unaffected.
To adjust the Hue qualifier using one of the color swatches
µ
Shift-click any of the swatches.
The Hue qualifier resets itself to select the corresponding range of color.
Key Blur
The Key Blur parameter lets you apply a uniform blur to the keyed matte in order to soften
it. This can go a long way toward making an otherwise noisy or hard-to-pull key usable.
This parameter defaults to 0, with a maximum possible value of 8.
267 Chapter 10 The Secondaries Room