Adobe AFTER EFFECTS 5.5 Help Manual page 60

Adobe After Effects Help
Using Help | Contents
Adjusting the appearance of low-resolution compositions
When setting resolution, you can determine the size and appearance of the composition.
When you lower the resolution of a composition, you can maintain image clarity by
reducing the composition's size. You can also maintain its size but reduce image clarity,
with the layers appearing blockier and more pixelated. The smaller on-screen image will
update faster than the original-size image with a lower resolution.
A
A. Original composition resolution B. Half resolution with the same clarity but with a reduction in
screen size C. Half resolution with the same screen size but with a reduction in clarity
To determine the appearance of lower-resolution compositions:
1 Choose Edit > Preferences > Display.
2 Select Auto-Zoom When Resolution Changes to reduce the size of the composition
while maintaining image clarity. Deselect this option to maintain the composition size in
the Composition window but display layers with less clarity.
3 Click OK.
You can also set the magnification using the pop-up menu in the Composition
window.
Setting start timecode or start frame
Use the Composition Settings dialog box to determine when the composition will begin.
The name of the option in the Composition Settings dialog box is determined by whether
Timecode, Frames, or Feet + Frames is selected in the Project Settings dialog box. For
example, if Timecode Base is specified, you can use the Start Timecode option to specify
when the composition will begin; if Frames is selected, you can use the Start Frame option
to specify the frame number where the composition will begin. See "Setting time-display
options" on page 9.
Setting duration
The duration is the overall length of the composition. Set duration by typing values in the
Duration box in the Composition Settings dialog box.
When you preview or render a movie, you can choose to preview or render only a portion
of the total duration. See "Setting up a work area" on page 70.
Understanding advanced composition settings
When you click the Advanced tab in the Composition Settings dialog box, you can change
the anchor setting, adjust the shutter angle for motion blur, specify when the shutter
opens relative to the frame start, set precompose options, and specify a rendering plug-in.
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