Apple Color 1.5 - Manual (Page 265)

Each qualifier has three sets of handles—center, range, and tolerance—which correspond
to three knobs on compatible control surfaces. These handles can also be manipulated
directly onscreen using the mouse.
Range
Center
Tolerance
HSL Qualifiers Explained
To make HSL adjustments efficiently, you should have an in-depth understanding of the
nature of each type of adjustment.
• H (hue): Defines the range of colors that contribute to the key. Using hue by itself to
define a keyed matte can yield similar results to using the Hue, Sat, and Lum secondary
curves. Because the visible spectrum is represented by a wraparound gradient, the H
handles are the only ones that wrap around the ends of this control, allowing you to
select a complete range of blue to green, when necessary.
• S (saturation): Defines the range of saturation that contributes to the key. Using
saturation by itself to define a keyed matte can be effective for manually limiting
oversaturated colors. Using saturation and hue, but excluding lightness, lets you
manually limit specific colors throughout the image regardless of their lightness.
• L (lightness): Defines the range of lightness that contributes to the key. Using lightness
by itself to define a keyed matte is an extremely powerful technique that lets you quickly
isolate regions of the highlights, midtones, or shadows to perform specific adjustments
such as increasing or reducing the specific lightness of shadows, or manipulating the
color within highlights.
• Reset button: Resets all three qualifiers to the default state, which is an all-inclusive
selection.
HSL Qualifier Controls
This section describes the HSL qualifier controls.
• Center: A single handle defines the middle of the selected range of values.
• Range: An inner pair of handles to the left and right of the center handle defines the
initial range of values that contribute to the keyed matte. These are the solid white
pixels seen in the matte.
265 Chapter 10 The Secondaries Room