User Guide

195
ADOBE AFTER EFFECTS 5.0
User Guide
Once the cache is full, and you continue to advance either sequentially or nonsequentially
through frames in your composition, any additional frame added to the cache replaces the
earliest cached frame in order to make room for the new frame. When you compile frames
for RAM previews, once the cache is full, After Effects ceases adding frames to the cache
and the preview begins playback of only the frames that could fit in the cache. The size of
the cache is limited to the amount of RAM available to After Effects. The number of frames
that can occupy the cache depends on the composition settings.
To purge the cache:
Make sure that the Timeline window is selected, and choose Edit > Purge > Image Caches.
About dynamic resolution
As you drag layers in the Composition window, or use the Manual Preview option, After
Effects dynamically updates each frame in the Composition window. If necessary, After
Effects dynamically degrades the resolution of the layer. This reduces the amount of data
that needs to be compiled during the edit and thereby facilitates a smooth, quick update.
Once the update is complete, the layer returns to the designated composition resolution.
You can set the maximum level of degradation to apply to a layer.
To set dynamic resolution:
1 Choose Edit > Preferences > Previews.
2 Select the Use Dynamic Resolution option to turn dynamic resolution on or off.
To set the degradation limit:
1 Turn on dynamic resolution as outlined in the above procedure.
2 Click the Degradation Limit menu and select an option. The options represent the
maximum fraction of data removed from a layer’s current composition resolution when
After Effects enacts dynamic resolution.
UG.book Page 195 Wednesday, February 21, 2001 12:05 PM