Adobe 12040118 - After Effects Standard Tutorial page 173

can change the panel background color using the Brightness control in the Appearance preferences.
2. Do one of the following:
To preview using RAM Preview Options, click the RAM Preview button
To preview using Shift+RAM Preview Options, Shift-click the RAM Preview button
numeric keypad.
3. To stop a RAM preview, do one of the following:
To leave the current-time indicator at the last-played frame, press the spacebar.
To leave the current-time indicator where it was before you started the RAM preview, click the RAM preview button or press any button
other than the spacebar.
Note: The performance of RAM previews performed with the Render Multiple Frames Simultaneously preference selected may be decreased if
antivirus software is running.
Press the asterisk key (*) on the numeric keypad during a RAM preview to place a marker at the currently previewed frame. This is a
convenient way to place markers corresponding to important points in an audio track. (See
RAM preview a specified number of frames
Press Alt (Windows) or Option (Mac OS) while initiating a RAM preview to preview the specified number of frames up to and including the current
frame. The default number of frames previewed with this command is 5. The preference for changing this number is in the Alternate RAM Preview
section of the Preview preferences. (See
Note: If the current frame is within a backward-propagating Roto Brush span and the Layer panel View menu is set to Roto Brush, then this
command in the Layer panel previews the frames including and after the current frame. (See
Save a RAM preview as a movie
After Effects can save RAM previews as uncompressed AVI files (Windows) or MOV files (Mac OS). When saving a RAM preview, keep in mind
the following:
After Effects uses the composition frame size and the Resolution setting in the default render settings template to determine the final
dimensions in pixels of a saved RAM preview. If the Resolution setting in the render settings template is Current Settings, then the
Resolution setting in the Preview panel is used. If the Resolution setting in the Preview panel is Auto, then the Resolution setting in the
Composition Settings dialog box is used. The saved RAM preview doesn't consider the zoom level.
RAM preview doesn't generate interlaced fields, so a saved RAM preview never contains fields.
Note: The 3D View of the active composition panel must be set to Active Camera for Save RAM Preview to work, even if the composition doesn't
contain 3D layers.
1. After you generate a RAM preview, choose Composition > Save RAM Preview.
2. Enter a name, specify a location, and click Save.
Loop options for previews
Click the Loop Options button in the Preview panel until it shows the desired state:
Loop Repeatedly plays preview from beginning to end.
Play Once Plays preview once.
Ping Pong Repeatedly plays preview, alternating between backward and forward play.
Preview only audio
When you preview only audio, it plays immediately at real-time speed, unless you've applied Audio effects other than Stereo Mixer, in which case
you may have to wait for audio to render before it plays.
Note:
If audio must be rendered for a preview, then only the amount of audio specified by the Duration setting in the Previews preferences is
rendered and played for the preview. The default is 30 seconds.
Set the sample rate for audio for the entire project in the Project Settings dialog box (File > Project Settings). CD-quality sound is 44.1 KHz, 16-bit
stereo.
The Audio Hardware and Audio Output Mapping preferences determine the behavior of audio previews. These preferences do not affect final
output. The output module settings determine the quality of audio in final output. For best-quality audio previews, choose an ASIO device if one is
available in the Default Device menu in the Audio Hardware preferences. Otherwise, choose one of the devices for your system, such as the After
Effects WDM Sound device (Windows) or one of the Built-in devices (Mac OS).
To preview only audio from the current time, choose Composition > Preview > Audio Preview (Here Forward) or press the decimal point key
(.) on the numeric keypad.
To preview only audio in the work area, choose Composition > Preview > Audio Preview (Work Area) or press Alt+decimal point (.)
Previews preferences (CS5.5, and earlier)
in the Preview panel or press 0 (zero) on the numeric keypad.
in the Preview panel or press Shift+0 (zero) on the
Layer markers and composition
or Previews preferences (CS6).)
Roto Brush strokes, spans, and base
markers.)
frames.)