After Effects uses a resolution-Independent system of layers, objects and a timeline wherein objects and video files can be placed within a composition and the position, opacity, size and other effects can be animated along the timeline to control the visual effect seen by the viewer. It's often thought of as "Photoshop with time added."
Although After Effects can create images of its own, it is generally used to combine 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 video editing program. However, one difference between After Effects and video editors is that After Effects is layer-oriented, and video editors 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, video editors 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.
* After Effects can convert any 2D layer into a plane in 3D space.
* After Effects also has the capability of rotoscoping
* After Effects can be used for digital conversion between different frame rates such as the 29.97 frames per second used in NTSC material and the 25 fps used in PAL video
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