AfterEffects uses a system of layers organized on a timeline to create
composites from still images and motion footage, such as video files.
Properties such as position and opacity can be controlled independently
for each layer, and each layer can have effects applied. After Effects
is often described as the "Photoshop of video", because its flexibility
allows compositors to alter video in any way they see fit, as Photoshop
does for images.

Although After Effects can create images of its
own, it is generally used to composite material from other sources to
make moving graphics (also known as motion graphics). For example, with
a picture of a space ship and a picture of a star background, After
Effects could be used to place the ship in front of the background and
animate it to move across the stars.

Each picture or movie is
layered on a timeline, in a similar way to a Non-Linear Editing System
(NLE). However, one difference between After Effects and NLEs is that
After Effects is layer-oriented, and NLEs are generally track-oriented.
This means that in After Effects, each individual media object (video
clip, audio clip, still image, etc.) occupies its own track. However,
NLEs use a system where individual media objects can occupy the same
track as long as they do not overlap in time. This track-oriented
system is more suited for editing and can keep project files much more
concise. The layer-oriented system that After Effects adopts is suited
for extensive effects work and keyframing. Although other compositing
packages--especially ones that employ tree or node workflows, such as
Apple Shake--are better suited to manage large volumes of objects
within a composite, After Effects is able to somewhat counter the
clutter by selectively hiding layers (using the Shy switch) or by
grouping them into precompositions. (After Effects does feature a
Flowchart panel, which is similar to tree or node graph, but this view
of a composition is mostly for display purposes and is not fully
functional.) The main interface consists of several panels (windows in
versions prior to After Effects 7.0). Three of the most commonly used
panels are the Project panel, the Composition panel, and the Timeline
panel. The Project panel acts as a bin to import stills, video, and
audio footage items. Footage items in the Project panel are used in the
Timeline panel, where layer order and timing can be adjusted. The items
visible at the current time marker are displayed in the Composition
panel.

After Effects integrates with other Adobe software titles such as Illustrator, Photoshop, Premiere Pro, and Encore.

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