Smooth curve with anchor points and control handles — defines motion paths in animation and color grading. Essential in VFX and timeline editors.
The Bézier curve defines every motion path in your compositor, every keyframe interpolation in the timeline. You define anchor points and control the curve's shape with handles — the system mathematically smooths the intermediate points. Unlike straight lines between keyframes or stiff jumps, the Bézier curve allows you organic, predictable motion without jerkiness.
You don't need to deal with this on set. But in the VFX workflow — whether rotoscoping, tracking, or motion graphics — your brain works almost exclusively with Bézier curves. In After Effects, you set a position at Keyframe 1, then set the next at Keyframe 100. The software connects these linearly. If you want smooth acceleration or a gentle deceleration, you pull the handles to the right and left of the anchor point — the curve bends, and the motion path becomes non-linear. This is the core concept: two anchor points plus one or two control handles each form a cubic curve.
You use the same principle in color grading. A curve adjustment in a grading tool works internally with Bézier curves: you place points in your tone or color diagram, pull their handles, and thereby control how the tones transition between black and white, or between color ranges. No hard edges, no posterization — just smooth transitions. Tracking software and 3D compositing packages also build on this model. As soon as you need to draw a mask (roto), you define a contour from Bézier segments. Each corner is an anchor point, and the handles shape the curve between them.
The practical advantage: Bézier curves scale elegantly. If you change the position of an anchor point in rotoscoping, all dependent segments adjust automatically. Unlike pixel-based masks, the shape remains vector-based, lossless, and editable with arbitrary precision. Beginners often think they have to manipulate every point individually. In reality, you quickly learn: with the right anchor points and handles, you can create complex contours with surprisingly few clicks. That's efficiency — and precisely why the Bézier curve has been the standard in every motion graphics and VFX tool for decades.