Apple Final Cut Pro 5 - Manual (Page 1264)

Chapter 20 Color Correcting Clips 477
II
Limit Effect Controls
You can use the color value, saturation, and luminance of your clip together or
separately to perform a key using the Limit Effect controls. For example, if you want to
modify only the bright areas of your picture, you can disable both color and saturation,
and perform only a luminance key.
 Enable/Disable checkbox: Make sure there’s a checkmark in this checkbox for the
Limit Effect controls you want to use. This lets you add or remove color, saturation, or
luminance from the criteria used to define a key.
 Reset button: Click to restore the Color Range, Saturation, and Luminance controls to
their default values. Shift-click the button to reset all three controls at once.
 Color Range control: Allows you to fine-tune the range of color that you want to key on.
 Top handles: Let you select a larger or smaller range of colors that are keyed, based
on the original colors you selected with the Select Color tool (the eyedropper). These
handles correspond to the Chroma Width control in the numeric filter controls.
 Color gradient: Drag left or right within the color gradient to shift the overall hue
of the color range you’ve set with the top set of handles. This corresponds to the
Chroma Center control in the numeric filter controls.
 Bottom handles: Allow you to define the tolerance of your key. These handles
correspond to the Chroma Softness control in the numeric filter controls.
 Sat control: Allows you to adjust the degree and range of saturation that contributes
to defining your key. The top and bottom handles work the same as those in the
Color Range control. Drag left or right within the gradient to move all four handles
simultaneously.
 Luma control: Allows you to adjust the degree and range of luminance that
contributes to defining your key. The top and bottom handles work the same as
those in the Color Range control. Drag left or right within the gradient to move all
four handles simultaneously.
 Edge Thin slider: Allows you to modify the keyed area by shrinking or expanding it.
Using Edge Thin, you can control a noisy key, filling in small gaps and adjusting the
edge of the key to include borderline values that are otherwise difficult to get at
using the other controls.
 Softening slider: Allows you to soften the edges of the key, creating gentler
transitions between affected and unaffected parts of the image.
Top handle
Enable/Disable checkbox
Reset button
Saturation control Luminance control
Color Range control
Bottom handle