2 Choose a Keying effect (or Chroma, Blue Screen, Green Screen, or Non Red). 3 Drag the effect to a clip in the Timeline or Sceneline. 4 (Optional) Click the Edit Effects button at the bottom of the Tasks panel to open the Properties view, and expand the effect name to view and edit the effect’s options. Replacing a background color with another image A. Upper clip B. Blue Screen automatically makes the background transparent C. Lower clip D. Combined clips More Help topics “ Keying ” on page 176 Create transparency with the Track Matte Key effect 1 If you haven’t already done so, add the matte file to the project: Click Project in the Tasks panel, and then click Get Media. Navigate to the matte file, and click Open. The matte file should preferably contain only a single shape (for example, a star or a flower). 2 Add a background clip to a track in the Timeline. 3 Add the clip you want to superimpose over the background clip to any track higher than the background clip. This is the clip revealed by the track matte. 4 On a third track, add the clip that serves as the matte. (If you need to add a third track, drag the matte to an empty area in the Timeline above the highest video track; a new track is automatically created.) 5 In the Effects view, expand the Video Effects folder and the Keying category folder, and drag the Track Matte Key effect to the superimposed clip (the clip above the background clip). A B C D A B C D
159 USING ADOBE PREMIERE ELEMENTS 10 Applying effects Last updated 11/22/2011 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. More Help topics “ Track Matte Key ” on page 181 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).
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