Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 201)

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Last updated 12/21/2009

Chapter 7: Views and previews

Previewing

When you want to view certain crucial frames in a composition—such as when showing them to a client for interim

approval—you may want to create a contact sheet. Jeff Almasol provides a script that creates a contact sheet that

consists of a grid of specific individual frames from a composition. You specify which frames to show by setting layer

markers. For more information, go to

Jeff Almasol's redefinery website.

Preview video and audio

You can preview all or part of your composition as you work, without rendering to final output. Though it is common

to speak of rendering as if this term only applies to final output, the processes of creating previews to show in the

Footage, Layer, and Composition panels are also kinds of rendering.

Many of the controls for previewing are in the Preview panel.

With all previewing methods—as with rendering to final output—a layer is only visible in rendered previews if its

Video layer switch

is selected.

Some factors that influence the speed with which previews are rendered include layer switches, Fast Previews settings,

preference settings, and composition settings.

One of the simplest and most influential of the preview settings controls is the Resolution/Down Sample Factor setting

menu at the bottom of the Composition panel. Choose a value other than Full from this menu to see all previews at a

lower resolution. (See

“Resolution” on page 206.)

To turn pixel-aspect ratio correction on or off for previews, click the Toggle Pixel Aspect Ratio Correction button

at the bottom of the panel. Because the scaling is not of high quality, use pixel aspect ratio correction to evaluate

shapes, not fine pixel detail. (See

“Pixel aspect ratio and frame aspect ratio” on page 77.)

When possible, preview on the same kind of device that your audience will use to view your final output. For example,

you can preview on an external video monitor. To see your composition as it will appear on a mobile device—such as

a mobile phone—first render your composition to final output, and then use Adobe Device Central to view the movie.

If you create compositions for mobile devices using Device Central, you can preview the compositions within After

Effects with guides and settings that simulate some aspects of the target mobile devices. (See

“Create compositions for

playback on mobile devices” on page 56.)

If color management is enabled, you can preview a composition, layer, or footage item as it will appear in the output

color space. (See

“Simulate how colors will appear on a different output device” on page 292.)

Note: Select Show Rendering Progress In Info Panel And Flowchart (Edit > Preferences > Display (Windows) or After

Effects

> Preferences > Display (Mac OS)) to see additional information in the Info panel or the project Flowchart panel

during rendering, either for previews or for final output.

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Adobe After Effects CS4 Manual de usuario Pagina 201

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