Adobe AFTER EFFECTS 5.5 Help Manual page 40

Adobe After Effects Help
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resolve both of these issues while preserving image quality. See "About 3:2 pulldown"
on page 44.
Note: To use an After Effects movie in an analog motion-picture film, you must transfer the
movie back to the analog film medium. This transfer process is generally done at a post-
production facility.
Digital video
Digital video carries picture information by representing each pixel of a video frame as a
discrete color value, and transmitting and storing the pixel values in the binary data
format used by computers. Sound is also carried as binary data.
Digital video is not one format, but a medium within which many file formats exist. Even if
your source footage was created digitally, you still need to make sure that it is stored in a
file format that After Effects can import.
If you plan to distribute the movie digitally, for example on CD-ROM, you must render it in
a file format appropriate for your distribution method. For more information, see "Making
(rendering) a movie" on page 278.
Note: DV video format is a form of digital video that can be downloaded directly to your
hard disk for editing in applications such as Adobe After Effects and Adobe Premiere. Many
DV decks can connect directly to a computer using an IEEE 1394 (FireWire
interface. See "About D1, DV, and various pixel aspect ratio footage" on page 46.
Interlaced and noninterlaced footage
Another way to classify analog or digital footage is as interlaced or noninterlaced. Currently,
most broadcast video is interlaced; each frame consists of two fields displayed in turn. The
computer operating system and After Effects display noninterlaced video, also known as
progressive scan, in which each frame is displayed completely from top to bottom. When
you finish creating a movie for display on a television, After Effects can render it back to
fields, maintaining high quality for broadcast display.
Interlaced video consists of two fields, known either as Field 1 and Field 2, even and odd,
or (as After Effects refers to them) upper and lower. When these fields are presented
sequentially on an NTSC or PAL video monitor they create a smooth, unified picture. See
"Frames and fields" on page 9.
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Preparing and Importing Footage
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