a) Create a new composition at the smaller dimensions, and nest the large composition inside it.
Select Composition>New>Preset "NTSC DV Widescreen" (Lock aspect ratio to 16x9)
Gives you a final movie size of 720x480 pixels
b) Scale the big composition to fit into the smaller one exactly
Choose Layer> Fit to Comp
c) Collapse Transformations
Choose Layer > Switches > Collapse
d) Render this composition at full resolution and best quality.
Choose Composition>Make Movie>check Full resolution and check AUDIO ON if you have audio.
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.
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