Adobe AFTER EFFECTS 5.5 Help Manual page 12

Adobe After Effects Help
Using Help | Contents
To undo the most recent change:
Choose Edit > Undo. You can sequentially undo as many as 99 of the most recent changes
made to the program in any After Effects window, depending on how many undo levels
are set in Preferences.
To set the number of undo levels:
1 Choose Edit > Preferences > General.
2 Specify a number for Levels of Undo, and then click OK.
To revert to the last saved version:
Choose File > Revert.
Selecting 16-bpc color depth (PB only)
After Effects can work in 16-bit-per-channel mode, making a larger range of colors
available. When you work with high-resolution images that use a narrow range of colors,
such as when you're creating subtle gradients for film effects or HDTV output, transitions
between colors are smoother with less visible banding, and more detail is preserved.
You can choose whether to work in 8-bit-per-channel or 16-bit-per-channel color mode
for each project. Directly import 16-bit images, including those from Photoshop, and
composite and color-correct footage in 16-bit mode. Take advantage of 16-bit color when
performing most After Effects tasks, including layer adjustment, frame blending, 3D, and
Cineon file import. The Info palette displays 16-bit color values with exact precision.
Many effects support 16 bits per channel. If an effect supports only 8 bits, and your project
is set to 16 bits, After Effects displays a warning icon ( ) next to the effect name in the
Effect Controls palette. Using an 8-bit effect in a 16-bit project will result in a loss of detail
for the effect's layer.
When rendering to output module depths of Trillions of Colors, set the project to 16-bit
color depth to take advantage of the output file's extra color precision. To optimize perfor-
mance, rough out a composition in 8-bit color mode, and then finalize and output 16-bit
files for maximum quality.
To specify color depth:
1 Open the project and choose File > Project Settings.
2 For Depth, choose 8 bits per channel or 16 bits per channel, and then click OK.
Hold down Alt (Windows) or Option (Mac OS) and click the color depth indicator at
the bottom of the project window to toggle between 8- and 16-bits per channel color.
Setting preferences
When you start After Effects for the first time, the default settings are used. You may want
to change some of these default settings so that each time After Effects is opened, it uses
your selections instead of the standard defaults. After changing settings, you can easily
restore the default settings at any time. All After Effects default settings are stored in a
single file.
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