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A key frame (or '''keyframe''') in Animation and Filmmaking is a drawing which defines the starting and ending points of any Smooth Transition . They are called "frames" because their position in time is measured in Frame s on a strip of film. A sequence of keyframes defines ''which'' movement the spectator will see, whereas the position of the keyframes on the film, video or animation defines the Timing of the movement. Because only two or three keyframes over the span of a second does not create the illusion of movement, the remaining frames are filled with Inbetweens . TRADITIONAL ANIMATION In the workflow of traditional hand-drawn animation, the senior or key artist would draw the keyframes, then, after testing and approval of the rough animation, hand over the scene to his assistant. The assistant does the Clean-up and the necessary 'inbetweens', or, in really big studios, only some Breakdown s which define the movement in more detail, then hand down the scene to his assistant, the 'inbetweener' who does the rest. COMPUTER ANIMATION Use of key frames In computer animation this workflow is basically the same. The animator creates the important frames of a sequence, then the software fills in the gap. For example, in Adobe Flash , the animator can specify, in keyframes, the starting and ending position of an object, such as a Circle . Flash smoothly Translates the object from the starting point to the ending point. This is called Tweening . The animator can correct the result at any point in time, shifting keyframes back and forth to improve the timing and dynamics of a movement, or change an 'inbetween' into an additional keyframe to further refine the movement. Keyframing There is also an animation technique known as keyframing. Contrary to tweening, every frame of a keyframed computer animation is directly modified or manipulated by the creator, such that no tweening has actually occurred. This method is similar to the drawing of traditional animation, and is chosen by artists who wish to have complete control over the animation. VIDEO EDITING In Non-linear Digital Video Editing as well as in video Compositing software, 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. IN-DEPTH EXAMPLES As noted above, a key frame defines the starting and ending points of any smooth transition. Consider the examples below, created using Animated GIFs : As applied to motion An object will move from the top left corner of the frame to the bottom right corner. One of the two keyframes present in this animation will contain the object at the top left corner of the frame, while the other keyframe will show the object at the bottom right corner. Everything in between can be Interpolate d smoothly. |
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