Motion Blur

Motion blur is the smear a moving subject leaves within a single frame because it travels while the shutter is open. It is what makes real footage feel fluid; without it, fast motion looks stuttery and strobing. In live action, shutter angle and shutter speed control how much blur is captured, with a 180-degree shutter being the common natural-looking standard. In motion graphics and VFX, animation is sharp by default, so artists enable computed motion blur to make moving layers and 3D elements match the look of filmed footage. Editors care about motion blur when speed-ramping clips (it must scale believably), when keying or compositing (blurred edges complicate mattes), and when graphics zip across screen and need blur to avoid looking artificial. Right motion blur is key to convincing, comfortable movement.