Adobe AFTER EFFECTS 5.5 Help Manual page 59

Adobe After Effects Help
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Each motion-footage item in a composition can also have a frame rate, and the
relationship between the footage-item frame rate and the composition frame rate deter-
mines how smoothly the layer plays. For example, if the footage-item frame rate is 30 fps
and the composition frame rate is 30 fps, whenever the layer advances one frame, the next
composition frame is displayed. If the footage-item frame rate is 15 fps and the compo-
sition frame rate is 30 fps, then two composition frames are displayed before the current
layer advances one frame, unless frame blending is enabled. (See "Using frame blending"
on page 89.)
When you use footage that was shot or rendered at the NTSC-standard rate of 29.97 fps
and the composition frame rate is 30 fps, approximately two footage frames will be
repeated every minute to compensate for the differing rates. To avoid repeated frames,
make sure that your composition frame rate matches your source footage, or enable frame
blending for the layers.
Setting resolution
Resolution determines the dimensions of the image in pixels, which affects the image
quality of the rendered composition. Setting a low resolution significantly increases
frame-rendering speed and decreases the amount of memory required to render. You can
use a low-resolution setting when animating or previewing a movie, and then increase the
resolution before rendering your final movie.
Choose from the following resolution settings in the Composition Settings dialog box:
Full Resolution Renders each pixel in a composition. This setting gives you the best
image quality, but takes the longest to render.
Half Resolution Renders one-quarter of the pixels contained in the full-resolution
image—half the columns and half the rows. This results in a rendering time approximately
one-fourth of the time required to render the entire image at full resolution.
Third Resolution Renders one-ninth of the pixels contained in the full-resolution image.
This results in a rendering time approximately one-ninth of the time required to render
the entire image at full resolution.
Quarter Resolution Renders one-sixteenth of the pixels contained in the full-resolution
image. This results in a rendering time approximately one-sixteenth of the time required
to render the entire image at full resolution.
Custom Resolution Renders the image at the resolution you specify.
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Building a Composition
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