Adobe 25520388 User Guide - Page 388

USING ADOBE PREMIERE PRO 383 Effects and transitions 9 From the Difference Layer drop-down menu, select the track that contains the matte frame. 10 Adjust the other settings as needed to achieve the desired effect. 11 (Optional) If you're animating the Difference Matte, move the current-time indicator either in the Effect Controls panel or Timeline panel and change the Image Matte settings. A new keyframe appears in the Effect Controls timeline when you change the settings. You can also adjust the interpolation between keyframes by editing the keyframe graph. Repeat this step as needed. More Help topics "Export a still image" on page 441 "Modify keyframe values" on page 420 Eight-Point, Four-Point, and Sixteen-Point Garbage Matte effects The three Garbage Matte effects aid in cropping out extraneous portions of a shot so that you can apply and adjust a key effect more effectively. The mattes are applied with either four, eight, or 16 adjustment points for more detailed keying. Once you apply the effect, click the Transform icon next to the effect name in the Effect Controls panel. This displays the garbage matte handles in the Program Monitor. To adjust the matte, drag the handles in the Program Monitor or drag the controls in the Effect Controls panel. Maxim Jago demonstrates animation of garbage mattes on the video2brain website. Mask out objects with garbage mattes Sometimes the subject of a scene is properly keyed except for undesired objects. Use a garbage matte to mask out those objects. Depending on the shape of the mask, you can use the Four-Point Garbage Matte, Eight-Point Garbage Matte, or Sixteen-Point Garbage Matte. More points let you define more complex mask shapes. The Garbage Matte keying effect provides settings that represent the x and y pixel coordinates of each point of the garbage matte, measured from the top left corner of the frame. Changes appear in the Preview view of the Program Monitor. The microphone (left) is masked out by repositioning image handles in the Preview view of the Program Monitor (center), creating a garbage matte that is then keyed and superimposed over a background (right). 1 In a Timeline panel, place the clip you want to superimpose in a track above the one containing the background clip. 2 In the Effects panel, click the triangle to expand the Video Effects bin and then click the triangle to expand the Keying bin. 3 Drag either the Eight-Point Garbage Matte, the Four-Point Garbage Matte, or the Sixteen-Point Garbage Matte effect to the superimposed clip. Your choice of garbage matte depends on the number of points needed for mask shape. 4 In the Effect Controls panel, click the triangle next to the Garbage Matte name to expand the settings. 5 (Optional) If you're animating the Garbage Matte Key over time, make sure that the current-time indicator is in the position you want. Click the Toggle Animation icons for the position settings you plan to adjust. Last updated 1/16/2012