Invert or hide alpha channels – Adobe Premiere Elements 12 User Manual
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Note:
Note:
Ignore Alpha Channel
Invert Alpha Channel
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 panel, expand the Keying category, and drag a garbage matte effect to the clip.
3. Click the Applied Effects button to open the Applied Effects panel.
4. In the Applied Effects panel, click the triangle next to the effect’s name to expand it.
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 Applied Effects panel.
Invert or hide alpha channels
You can use the Interpret Footage command to change how Premiere Elements interprets a clip’s alpha channel throughout a project.
To ignore or invert the alpha channel of only a single instance of the clip, apply the Alpha Adjust keying effect instead.
1. Select a clip in the Project Assets panel.
2. Choose File > Interpret Footage, specify Alpha Channel options as needed, and click OK.
Ignores the alpha channel included with the clip.
Reverses the light and dark areas of the alpha channel, which reverses the transparent and opaque areas of the
clip.
Tip: If you have difficulty identifying which parts of a clip are transparent, temporarily add a bright color matte on a track below the image
you are keying. (See Create a colored matte for a background.)
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