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Adobe Premiere Pro CC - 2015 Manual

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Compositing
Last updated 11/30/2015
Blend clips with a matte using the Track Matte Key effect
You can blend clips with a matte (typically, a black and white image, or an image from the Titler.) using the Track Matte
Key effect. For more information, see the article,
Track Matte Key effect .
Specify clip opacity in a Timeline panel
1 Expand the view of a track, if necessary, by clicking the triangle next to the track name to expand its options.
2 If necessary, click the Show Keyframes button , or the Hide Keyframes button , and choose Show Opacity
Handles from the menu. A horizontal opacity control rubber band appears in all the clips of the track.
Note: If no keyframes exist on the track, the rubber band appears as a straight horizontal line across the entire track.
3 In a Timeline panel, do one of the following:
• Select the Selection tool, and drag the opacity control rubber band up or down.
• Select the Pen tool, and drag the opacity control rubber band up or down.
The opacity value and current time appear as a tool tip as you drag.
4 (Optional) To animate the Opacity effect over time, first set keyframes. Select the Pen tool. Ctrl-click (Windows) or
Command-click (Mac OS) on the opacity control rubber band with the Pen tool wherever you want to set a
keyframe. Then drag each keyframe up or down to set its value. For example, to fade a clip in, create a keyframe at
the beginning of the clip and another a few seconds later. Drag the first down to the bottom of the clip at 0 opacity.
Drag the second up to 100%.
For information about adjusting opacity in the Effect Controls tab in the Source panel, see “Opacity” on the page:
Fixed effects.
You can use either the Selection tool or the Pen tool to move keyframes or Opacity handles. To adjust the smoothness
of the animation, change the keyframe interpolation from linear to Bezier.
Compositing tips
Keep the following guidelines in mind when compositing clips and tracks:
• If you want to apply the same amount of transparency to an entire clip, simply adjust the clip’s opacity in the Effect
Controls panel.
• It’s often most efficient to import a source file already containing an alpha channel defining the areas that you want
to be transparent. Because the transparency information is stored with the file, Premiere Pro preserves and displays
the clip with its transparency in all sequences where you use the file as a clip.
• If a clip’s source file doesn’t contain an alpha channel, you must manually apply transparency to individual clip
instances where you want transparency. You can apply transparency to a video clip in a sequence by adjusting clip
opacity or by applying effects.
• Applications such as Adobe After Effects, Adobe Photoshop, and Adobe Illustrator can save clips with their original
alpha channels, or add alpha channels, when the file is saved to a format that supports an alpha channel.
Blending modes
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