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Video overlay effects
Placing titles on a video is the simplest example of an overlay effect. An
overlay could also be a picture-in-picture effect over the anchor's shoulder
on the nightly news, or a shot of Superman flying over Metropolis. Overlays
are commonly superimposed over a background video with portions of the
overlay being transparent or keyed-out. Overlay effects can only be per-
formed on clips in the V1-V99 tracks, which are collectively known as the
Overlay tracks.
To create an image overlay effect:
1. Locate the Flower.mpg clip in the Samples
folder of the MediaStudio Pro CD and drag it
onto the Va track.
2. From the same folder, drag the photo2.jpg clip
onto the V1 track and line it up underneath the
clip in the Va track.
3. Click the Overlay Options button on the Timeline toolbar or click
Clip: Overlay Options. (This command can
also be selected from the right click pop-up
menu.) The Overlay Options dialog box
opens.
4. From the Type list, choose Color Key.
5. On the Overlay clip, click on the green area
with the Eyedropper.
6. Set the Similarity value to 23.
7. Click OK to close the dialog box and apply
the effect.
This procedure clearly demonstrates a simple overlay effect. If you preview
the work now, you should see the painter painting his house "over" the man
strolling outside. If your card supports an external monitor, you can watch
this preview directly on your television by selecting the External monitor
button in the Overlay Options dialog box.
MEDIASTUDIO PRO USER GUIDE
Lining up the clips
Using the Eyedropper
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