Apple Final Cut Pro 5 - Manual (Page 1265)

478 Part II Project Interchange
 Select Color button (the eyedropper): When you click this button, the pointer turns
into an eyedropper you can use to select a color from a clip in the Video tab of the
Viewer or in the Canvas. Shift-clicking this button allows you to select another region
of the background screen that wasn’t keyed out by your first use of this control,
thereby broadening the range of colors to be keyed out and enlarging the keyed-out
area. You can do this repeatedly to broaden the range of keyed-out color to include
shadows or highlights on the background screen, if necessary.
 View Final/Matte/Source button (the key): This button has three states:
 The default state (a gold key against a gray background) allows you to see the end
result—the effect happening within the keyed area.
 The second state (a black key against a white background) displays the key itself as
a grayscale image, so you can fine-tune it without being distracted by the image.
 The third state (a gold key against a blue background) shows only the original
video image.
 Invert Selection button: Click this button to invert the key you’ve defined. For
example, if you’ve set up a key based on the color of a green car and turned the
desaturation all the way down so that the car is grayscale and the background is
color, clicking the Invert Selection button makes the background turn grayscale, and
the car appears in color.
Invert Selection button
View Final/Matte/Source button
Select Color button
Using Multiple Filters Together With the Limit Effect Controls
You can use the Limit Effect controls to layer multiple color correction filters onto a
single clip, selectively balancing specific areas of your picture based on their color,
saturation, and luminance levels. Color correction filters work serially, the same as any
other filters. This means that if two color correction filters are applied to a single clip,
the second color correction filter works on the modified output of the first filter,
rather than on the original color values of the image.
For example, if you add a filter that adjusts the color in a group of flowers but causes
the green grass in the background to look too red, a second color correction filter
using the Limit Effect controls will target the greenish/red color of the grass as it has
been modified, rather than the original green values.