Key frame
Encyclopedia : K : KE : KEY : Key frame
In animation, a key frame is a frame in an animated sequence of frames that was drawn or otherwise constructed directly by the user. In hand-drawn animation, the senior artist would draw these frames, leaving the "in between" frames to an apprentice. In computer animation, the animator creates only the first and last frames of a simple sequence; the computer fills in the gap. This is called tweening.
In video compression, a key frame is a frame encoded without reference to any images in another frame. In this context, it is also often referred to as an intra frame or i-frame. It is often followed by one or more inter frames which are calculated from the preceding key frame.
In non-linear digital video editing, a key frame is a frame used to indicate the beginning or end of a change made to the signal. For instance, a key frame could be set to indicate the point at which audio will have faded up or down to a certain level.
- This article was originally based on material from the Free On-line Dictionary of Computing, which is [Foldoc licenselicensed] under the GFDL.
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