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Inbetweening
Inbetweening or ''tweening'' is the process of generating intermediate frames between two images to give the appearance that the first image evolves smoothly into the second image. Inbetweens are the drawings between the key frames which help to create the illusion of motion. Inbetweening is a key process in all types of animation, including computer animation.
== Digital animation ==
When animating in a digital context, especially with Adobe Flash, the shortened term ''tweening'' is commonly used. Sophisticated animation software enables one to identify specific objects in an image and define how they should move and change during the tweening process. Software may be used to manually render or adjust transitional frames by hand or may be used to automatically render transitional frames using interpolation of graphic parameters. In the context of Adobe Flash, inbetweening using automatic interpolation is called ''tweening'', and the resulting sequence of frames is called a ''tween''. The free software program Synfig also specializes in automated tweening.
"Ease-in" and "ease-out" in digital animation typically refer to a mechanism for defining the physics of the transition between two animation states, i.e., the linearity of a tween.〔(Set of graphs showing 30 different easing curves )〕
The use of computers for inbetweening was pioneered by Nestor Burtnyk and Marceli Wein at the National Research Council of Canada. They received a Technical Achievement Academy Award in 1997, for "pioneering work in the development of software techniques for computer assisted key framing for character animation".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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