Apple Final Cut Pro 6 - Manual (Page 1345)

560 Part III Color Correction and Video Quality Control
The way this works is that each color correction filter has a set of Limit Effect controls
that you can use to isolate a region of your clip based on color, luma, saturation, or any
combination of the three. The Limit Effect controls work in much the same way as a
chroma or luma keyer, except that instead of keying the color out, they limit the effect
of the color correction filter to just that area. This way, you can target the green grass,
the highlights in the trees, and the red lipstick of an actor in the scene with three
separate filters, giving you an extremely fine level of control over your image.
Step 4: Add other filters to address specific needs
After you’ve finished adding all the color correction filters necessary, you may find
yourself with some additional issues to resolve. Perhaps you can’t correct certain areas
of your clip without introducing unwanted color into the shadows or highlights. In this
case, you can use an additional filter, the Desaturate Highlights or Desaturate Lows
filter, to correct this quickly and easily. In another example, you may have discovered
that the combination of filters you’re using forces the chroma or luma to extend into
levels illegal for broadcast. In this situation, you can use the Broadcast Safe filter to
bring down the offending parts of the picture to acceptable levels.
Step 5: Match the coverage of the scene to the master shot
Once you’ve finished defining the look of the master shot in your scene, you can move
on to the rest of the shots. It’s easy to copy the settings of the color correction filters
you’re using to other pieces of the same master shot that you may have used in the
same scene. For example, if you cut back to the master shot five times in your scene,
you can simply copy the filters from the first piece of the master shot you corrected to
all other instances used in your sequence.
As you move into the coverage shots used in the scene, you’ll probably repeat steps 2
through 4 for each shot. You can compare each new shot with the master shot that you
corrected, switching back and forth rapidly to compare the look of one clip with that of
the other. By comparing the clips’ values on the video scopes, you’ll see how you need
to adjust the color correction filters you apply to make the clips’ color, blacks, and
whites match as closely as possible.
Remember, once you finish correcting one segment of a given clip, you can apply those
same settings to all other segments in that scene from the same clip. If you apply
multiple color correction filters to one clip, you can also apply them all to other clips.