Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 631

• To preserve audio pitch but not synchronization, or for clips without audio, right-click (Windows) or Control-
click (Mac OS) the footage item in the Project panel, select Interpret Footage > Main, select Conform To Frame
Rate, and then enter 23.976 in the Conform To Frame Rate box.
Select Composition > Make Movie.
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6 Choose Custom from the Render Settings menu.
In the Render Settings pane, enable Field Rendering (choose the field order required by your output type), select
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any option from the 3:2 Pulldown menu, and then click OK.
Choose the output type from the Render Queue Output Module menu (for example, Microsoft DV NTSC 32kHz).
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Click the Render button to render your movie.
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See also
"Work with output module settings" on page 594
"Work in the Render Queue panel" on page 585
Scaling a movie down
There are several methods for producing a reduced-size movie from your composition, each with tradeoffs between
speed and quality:
Create a new composition at the smaller dimensions, and nest the large composition inside it.
Nest the composition
For example, if you create a 640 x 480 composition, place it in a 320 x 240 composition. Use the Fit To Comp
command to scale the composition to fit the new smaller composition size: Press Ctrl+Alt+F (Windows) or
Command+Option+F (Mac OS), and then collapse transformations by choosing Layer > Switches > Collapse. The
resulting composition rendered at full resolution and best quality will have excellent image quality, better than if you
had rendered using a reduced resolution.
This method produces the highest quality reduced-size movie but is slower than nesting.
Stretch the composition
For example, if you create a 640 x 480 composition and render it at full resolution, you can set the stretch value in
the Output Module Settings dialog box to 50% to create a 320 x 240 movie. For a composition rendered at full
resolution, the image quality is excellent when the Stretch Quality is set to High.
Note: Do not use stretching to change the vertical dimensions of a movie when field rendering is on. Stretching vertically
mixes the field order, which distorts motion. Use either cropping or composition nesting if you need to vertically resize a
field-rendered movie.
This method is ideal for reducing the size of a movie by a few pixels. Use the Crop options in
Crop the composition
the Output Module Settings dialog box. Remember that cropping cuts off part of the movie, so objects centered in
the composition may not appear centered unless the movie is cropped evenly on opposite edges.
Crop to a region of interest
Composition panel. Then, select the Region Of Interest option in the Output Module Settings dialog box before
rendering. (See "Work with the region of interest" on page 115.)
Note: Cropping an odd number of pixels from the top of a field-rendered movie reverses the field order. For example, if
you crop one row of pixels from the top of a movie with Upper Field First field rendering, the field-rendering order then
becomes Lower Field First. Remember that if you crop pixels from the top of the movie, you need to add to the bottom
row of the movie to maintain the original size. If you are willing to lose one scan line, this gives you a way to output two
movies from one render, each with a different field order.
To render just a portion of the composition frame, define a region of interest in the
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