After Effects' newest Roto Brush still asks for cleanup

The shot

Rotoscoping, tracing or masking a moving subject frame by frame to separate it from its background, is one of the oldest manual tasks in visual effects, and After Effects has automated progressively more of it inside its Roto Brush tool. Adobe's own help documentation, retrieved 16 September 2026 via an archived copy of the current page, names the latest version Next-Gen Roto Brush, selectable as Roto Brush 3.0, and describes it as powered by a brand-new AI model that improves on the tool's prior version, Roto Brush 2.

What the documents show

Adobe's documentation is specific that this is an evolution of an existing AI-assisted feature, not a new capability: Roto Brush 2 already uses artificial intelligence to track a subject's movement, and Roto Brush 3 offers enhanced precision selecting and tracking objects over time, naming overlapping limbs, hair, and transparencies as cases it improves on. That is Adobe's own comparative claim about its two tool versions, not an independent measurement against a competing product. Separately, a newer beta feature called Object Matte, last updated 3 March 2026, states it is built on the same AI technology that powers the Object Mask workflow in Premiere, and reframes classic Roto Brush as one tool, renamed Quick Selection Tool, inside a larger suite that also includes a Selection Brush Tool and a Refine Edge Tool for manual correction.

The workflow

Under Roto Brush 3, an artist draws strokes over representative foreground and background areas on a base frame, After Effects builds a segmentation boundary, and the artist propagates that matte through the shot, watching a propagation banner track progress; if a later frame is wrong, the documentation describes drawing a corrective stroke there, which reshapes propagation on either side, before freezing the result. Object Matte follows a similar shape with different tools: preview a matte with the Object Matte Tool, refine the base-frame selection with the Quick Selection or Selection Brush tools, propagate forward, and, per Adobe's own instruction, review the propagated result and refine problem areas before freezing the matte for compositing.

What the tool does not change

Both documents describe a correction loop as normal, not an edge case: Roto Brush 3's workflow is built around adding corrective strokes wherever tracking drifts, and Object Matte's documentation instructs the artist to review and refine propagated results before finishing. Neither claims the AI model produces a finished matte without that review step; both assume an artist is watching the timeline and judging where the tracked edge has failed.

• Which frames in this shot are likely to need corrective strokes, hair, transparency, or overlapping limbs?
• Is the newer Object Matte beta tool, or the established Roto Brush 3, better matched to this footage?
• Has the propagated matte been reviewed frame by frame before it is frozen for compositing?

Two generations of Adobe's own masking tools, released years apart, both build the correction step into the basic workflow rather than treating it as optional. That consistency is a better guide to expected effort than either tool's marketing name.