Hide unwanted objects with a garbage matte – Adobe Premiere Elements 8 User Manual
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USING ADOBE PREMIERE ELEMENTS 8 EDITOR
Applying effects
Last updated 8/12/2010
6 Click the Edit Effects button at the bottom of the Tasks panel to open the Properties view.
7 In the Properties view, expand the Track Matte Key.
8 For Matte, choose the video track that contains the matte.
9 Adjust options as needed:
Composite Using
Select Matte Alpha to composite using the values in the alpha channel of the track matte. Select
Matte Luma to composite using the image’s luminance values instead.
Reverse
Inverts the values of the track matte.
To retain the original colors in the superimposed clip, use a grayscale image for the matte. Any color in the matte
removes the same level of color from the superimposed clip.
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Hide unwanted objects with a garbage matte
Sometimes a color-based keying effect properly removes a background, but undesired objects still appear, such as a
microphone or cable. Use a garbage matte keying effect to mask out those objects. Garbage mattes work well for areas
that have clearly defined boundaries but no uniform color to key. Garbage mattes also work well to clean up unwanted
artifacts that a color-based keying effect left behind.
Unwanted background (left) is masked out by reshaping the Four-Point Garbage Matte in the Monitor panel; then the Green Screen Key effect
is applied (center) to superimpose the boy over the underlying track (right).
1 Place a clip in a track.
2 In the Effects view, expand the Keying folder, and drag a garbage matte effect to the clip.
3 Click the Edit Effects button at the bottom of the Tasks panel to open the Properties view.
4 In the Properties view, click the triangle next to the effect’s name to expand it.
Note: The name of each garbage matte effect reflects the number of handles it provides: Four-Point Garbage Matte,
Eight-Point Garbage Matte, and Sixteen-Point Garbage Matte.
5 Do one of the following to reshape the matte:
•
Click the effect name to display the garbage matte effect’s point handles in the Monitor panel, and drag the handles.
•
Change the garbage matte effect’s values in the Properties view.
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