Keyframe Animation

The Foundation of Movement

Keyframe animation is the foundational principle behind almost all forms of animation, from traditional hand-drawn cartoons to modern 3D CGI and motion graphics. It is a highly efficient and artistic process that breaks down a complex motion into its most essential poses. Instead of drawing every single frame of an animation, the animator focuses on creating the keyframes.

The Keyframe and Inbetweening Process

The workflow is a division of labor that separates the creative art from the technical execution:

1. The Key Animator: A senior or lead animator is responsible for drawing the keyframes. These are the most important drawings in a sequence that define the beginning, end, and major points of an action. For example, to animate a character jumping, the key animator might draw the character crouching (keyframe 1), at the peak of their jump (keyframe 2), and landing (keyframe 3). The key animator makes all the critical decisions about timing, posing, acting, and energy.
2. The Inbetweener: An assistant animator, or ‘inbetweener,’ is then tasked with creating the frames that go in between the keyframes. Their job is to create a smooth transition from one key pose to the next, following the timing charts and notes left by the key animator.

This same principle applies to 3D animation, where an animator sets key poses for a character’s rig at different points on a timeline, and the computer automatically generates the ‘inbetweens,’ a process called interpolation.