Adobe Premiere Elements 12 - Manual (Page 137)

Color-based keying effects
Matte-based keying effects
Alpha channel-based keying effect
Note:
To the top
Note:
To the top
(Videomerge, Blue Screen Key, Chroma Key, Green Screen Key, and Non Red Key) Add transparency wherever a
particular color occurs in a clip. For example, you can use color-based keying effects to remove a background with a uniform color, such as a blue
screen.
(Four-, Eight-, and Sixteen-Point Garbage Matte Keys, and Track Matte Key) Let you mask out areas of a clip with
another clip or with areas you specify manually. You can add transparency according to the shape of a mask you position in the clip, or according
to the grayscale tones in a file that you use as a matte. You can also use the Track Matte Key effect to make creative composites.
The Alpha Adjust Key effect lets you invert or turn off a clip’s alpha channel or convert areas without
transparency to a mask.
For more information about keying out colors, see Help.
Create transparency with Videomerge
To automatically create transparency in the background of a clip, apply the Videomerge effect. This effect makes superimposing clips easy.
1. In the Quick view timeline or the Expert view timeline, right-click/ctrl-click the clip you want to make transparent, and choose Apply
Videomerge. (You can also choose Videomerge from the Effects panel.)
The effect automatically detects the background color and removes it, making underlying clips visible through the transparent areas.
2. (Optional) Click the Applied Effects button to open the Applied Effects panel, and expand the effect name to view and edit the effect’s
options.
Videomerge effect
A. Foreground clip with colored background B. Background automatically made transparent with Videomerge effect C. Background clip that
will show through transparency D. Combined clips
On Mac OS, the Videomerge dialog is not displayed when you drag a clip with a solid background. To apply Videomerge on Mac OS,
drag the clip to the Monitor panel, and then select the Videomerge option. You can also apply Videomerge from the Effects panel.
Create transparency with a keying effect
To create transparency wherever a specific color occurs in a clip, apply a color-based keying effect. These effects are commonly used to remove a
colored background.
1. In the Action bar, click Effects to display the Effects panel.
2. Choose a Keying effect (or Chroma, Blue Screen, Green Screen, or Non Red).
3. Drag the effect to a clip in the Quick view timeline or the Expert view timeline.
4. (Optional) Click the Applied Effects button to open the Applied Effects panel, and expand the effect name to view and edit the effect’s
options.
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