Adobe AFTER EFFECTS 5.5 Help Manual page 57

Adobe After Effects Help
Using Help | Contents
For Rendering Plug-In, you may want to specify a third-party plug-in for rendering 3D
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compositions. "Setting the rendering plug-in" on page 61.
To change a composition's settings:
1 Choose Composition > Composition Settings.
2 Adjust basic settings as explained in "Understanding basic composition settings" on
page 57.
3 Click the Advanced tab and adjust advanced settings as explained in "Understanding
advanced composition settings" on page 60 and click OK.
Note: You cannot undo changes that were made before changing the composition
settings.
Understanding basic composition settings
When you create a new composition, it appears as a new item in the Project window.
Before you set up a new composition, determine the specifications of the final output.
These specifications influence the composition settings you choose for frame size,
duration, frame rate, and pixel aspect ratio. Three factors determine composition settings:
The type of movie you are producing
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The requirements of any systems that will process the movie that After Effects renders
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The final delivery medium of the movie
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For best results, specify the composition settings at the beginning of your design process.
After Effects bases certain calculations on the composition settings, so changing settings
such as frame size and pixel aspect ratio late in the project can affect your final movie.
(However, you can override some composition settings when creating a movie. For
example, you might change the composition-frame size to a smaller image size when
rendering.)
Setting frame size
The Composition window in After Effects contains the viewing frame and an area outside
the frame that you can use to move layers into and out of the frame. For your convenience,
After Effects includes a variety of presets, each containing settings for frame size, pixel
aspect ratio, and frame rate. You can also create a custom preset and save it for later use.
Because After Effects can position footage items outside the frame, specify a frame size no
larger than the actual size of the final viewing screen. After Effects previews and renders
only the footage items within the frame. For information on working with high-resolution
images, see "Working with higher image resolutions" on page 26.
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Building a Composition
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