Apple Final Cut Pro 7 - Manual (Page 1381)

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 luma 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.
The Desaturate Highlights and Desaturate Lows Filters
Sometimes, the use of one of the Final Cut Pro color correction filters results in unwanted
colors appearing in either the highlights or shadows of your image. The Desaturate
Highlights and Desaturate Lows filters allow you to target a range of the brightest and
darkest areas of your image and desaturate them, which helps to keep the highlights and
shadows of your image free from coloration.
The Desaturate Highlights and Desaturate Lows filters are actually the same filter, but
with different default settings. If you need to desaturate the highlights and the shadows,
you can apply either filter once and then select both options.
1381 Chapter 81 Color Correction Filters