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259 ADOBE PREMIERE 5.0
User Guide
Chapter 8: Superimposing and
Compositing with Transparency
remiere lets you create full or partial transparency in any clip to add visual fades, super-
imposing, and compositing to your video programs. You can adjust the opacity of part
or all of a clip, superimpose clips on top of one another for special effects or transitions,
and add different backgrounds to clips by compositing them together.
About transparency
In video or film, transparency allows one clip to show through another, creating composites,
transitions, or special effects. The opacity of a clip or portion of a clip determines its level of
transparency. At 100% opacity, an image contains no transparency at all; at 0% opacity, the
image is completely transparent, allowing other clips to show through. At other percentages,
the image is partially transparent, allowing other underlying images to be visible at the
same time.
Certain parts of clips can be made transparent using tools called keys . A key finds pixels in
an image that match a specified color or brightness and makes those pixels transparent or
semitransparent, depending on the type of key. This process is called
keying , or keying out
the color.
You can create transparency in a clip only after you have placed it in a superimpose track.
By default, each new project includes one superimpose track, called Video 2. You can add
up to 97 superimpose tracks. See “Adding, naming, and deleting tracks” on page 144.
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