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Lower temporal quality tends to produce jerkiness of motion because a pixel doesn't
change unless the difference between frames is great.
7 If you want the smallest possible files, and your compressor choice allows for a key
frame rate, select the Key Frame Every option and type a number of frames. Generally, you
should type a number equal to the frame rate. For example, if you set a frame rate of 30
fps, type 30 in the Key Frame box. This sets one key frame every 30 frames of your movie.
Note: If you are going to use the resulting movie in another After Effects composition, type
a small value (less than 5) in the Key Frame Every field or deselect the Key Frame Every
option. The presence of key frames greatly increases the memory required to edit and
render a movie.
8 Click OK.
9 If your compressor choice supports different image color depths, choose the appro-
priate color depth in Output Module Settings dialog box. See "Setting QuickTime
compression options" on page 290.
10 Choose other options in the Output Module Settings dialog box, as described in
"Changing output module settings" on page 284. Then click OK.
Exporting a single frame of a composition
You can save a single frame from a composition to any output format or as an Adobe
Photoshop file with layers intact. One frame of the composition is rendered at the current
time as set in the Composition window. This is useful for editing files in Adobe Photoshop
or creating a proxy.
You can preserve the individual layers of a composition and save a frame of the compo-
sition as an Adobe Photoshop file. This makes it possible to use footage imported into
After Effects as images in Adobe Photoshop. Preserving layers is also useful if you want to
use a composition frame as a source for both print and dynamic media.
To export one frame of a composition:
1 In the Composition window, display the frame you want to export.
2 Choose Composition > Save Frame As > File.
3 Type a filename and click OK.
4 The Render Queue window is displayed. Adjust settings if necessary, and then click
Render.
To export a single composition frame as an Adobe Photoshop file with layers:
1 In the Composition window, display the frame you want to export.
2 Choose Composition > Save Frame As > Photoshop Layers.
3 Type a filename and click OK.
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Rendering a Movie
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