Apple Final Cut Express HD - Manual (Page 728)

728 Part IX Effects
8 In the keyframe graph area, move the pointer to the left of the two keyframes on the
Opacity value graph line. When the pointer turns into the Adjust Line Segment pointer,
drag down until the number field reads 0.
The shape you’ve given to the Opacity parameter’s keyframe graph line makes the top
layer completely invisible for the first 2 seconds of playback. Over the next 2 seconds it
fades up until it reaches a total opacity of 50 percent, and looks like an even mix of
both layers.
9 Move the playhead to 01:00:04:00, then add another opacity keyframe.
Since you can’t move this keyframe without causing a ramp in the overlay segment,
you need to add another keyframe.
10 Move the playhead again to 01:00:05:00, then add another keyframe.
11 Adjust the opacity setting of this last keyframe to 90 percent.
The shape of the Opacity parameter’s keyframe graph line leaves the opacity of the top
layer at 50 percent for 4 seconds, and then the topmost layer fades up to 100 percent,
completely obscuring the clip on track V1.
A segment at 50 percent
opacity results in an even
mix of both layers.
The ramp from 0 to 50
causes the clip on track V2
in the Timeline to fade up
over track V1.
A segment at 0 percent makes
the top layer invisible for the
duration of the segment.