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Adobe Premiere Pro CC - 2015 Manual

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Last updated 11/30/2015
Chapter 15: Compositing
Compositing, alpha channels, and adjusting clip opacity
Adobe After Effects provides a wide range of compositing tools. You can easily import composites made in After Effects
into Premiere Pro.
To create a composite from multiple images, you can make parts of one or more of the images transparent so that other
images can show through. You can make portions of an image transparent using any of several features in Premiere Pro,
inlcuding mattes and effects.
To make an entire clip uniformly transparent or semi-transparent, use the Opacity effect. You can set a selected clip’s
opacity in the Effect Controls panel or Timeline panel, and you can fade a clip down or up over time by animating
opacity.
If you simply want to create a fade to black, consider applying a transition such as Dip To Black to the clip instead of
animating opacity keyframes manually.
When part of a clip is transparent, transparency information is stored in its alpha channel.
Images can also be composited together without modifying the transparency of the clips themselves. For example, you
can use
Blending modesor some of the Channel effects to blend image data from multiple clips into a composite.
Clips on upper tracks cover clips on lower tracks except where alpha channels indicate transparency. Premiere Pro
composites clips from the lowest track up, to create a composite of clips on all visible tracks. Areas where all tracks are
empty or transparent appear black.
Rendering order affects how opacity interacts with visual effects. The Video Effects list is rendered first, then geometric
effects such as Motion are rendered, and then alpha channel adjustments are applied. Within each effects group, effects
are rendered from the top down in the list. Because Opacity is in the Fixed Effects list, it renders after the Video Effects
list. If you want opacity to render earlier or later than certain effects, or if you want to control additional opacity options,
apply the Alpha Adjust video effect.
You can choose how to interpret the alpha channel in a file in the Interpret Footage dialog box. Choose Invert Alpha
Channel to swap areas of opacity with areas of transparency, or choose Ignore Alpha Channel to not use the alpha
channel information at all.
If you have difficulty identifying which parts of a clip are transparent, choose Alpha from the Program view menu in
the Program Monitor. Another way to see areas of transparency is to add a bright solid color matte on a track below the
image you are keying.
Alpha channels and mattes
Color information is contained in three channels: red, green, and blue. In addition, an image can include an invisible
fourth channel, called an alpha channel, that contains transparency information.
An alpha channel provides a way to store images and their transparency information in a single file without disturbing
the color channels.
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