Apple iMovie HD - Manual (Page 61)

Chapter 8 Adding Titles and Chapter Markers 61
Placing Titles Over a Black or Colored Clip
You can place titles over movie footage or over a black or colored background.
To place a title on a black background:
1 Choose a title style and set up the title as you want it.
2 Select “Over black” and drag the title into the movie.
Placing a title on a background adds a few seconds to your video.
To place a title on a colored clip:
1 Add a black clip to your movie by dragging a clip to the right in the timeline viewer
and then switch to the clip viewer.
2 Select the black clip and choose File > Show Info.
3 Click the color box.
4 Choose the color you want in the Colors window (shown below).
5 Click Set.
6 Drag the title you want onto the color clip.
You can change the color of colored clips.