A set of parameters defining a point in a transition, e.g. of a DVE effect. For example a keyframe may define a picture size, position and rotation. Any digital effect must have a minimum of two keyframes, start and finish, although complex moves will use more, maybe hundreds.
Increasingly, more parameters are becoming ‘keyframeable’, i.e. they can be programmed to transition between two, or more, states. Examples are color correction to make a steady change of color, and keyer settings, perhaps to make an object slowly appear or disappear.
See also: DVE