Runway's Multi-Motion Brush animates different parts of an image independently and the results are genuinely cinematic

I do motion design work and I want to write about a specific Runway ML feature that I have not seen covered clearly in most overviews.

The Multi-Motion Brush extends the basic Motion Brush concept in a way that significantly increases the range of what you can create from a single still image.

Motion Brush lets you paint over an area and control how that area moves. That is already useful. Multi-Motion Brush lets you do that for multiple areas independently in the same image. Foreground elements move one way while background elements move differently. A character's hair moves while their face stays relatively still. Leaves blow in the background while the subject in the foreground has a different motion quality.

That independent control of multiple motion zones in a single image is what produces results that look compositionally intentional rather than like a still image that has been jiggled. The sense of depth that comes from foreground and background moving at different rates is something that reads cinematically rather than as an AI effect.

For motion design applications where you are working from a concept image or illustration and need to create an animated version, this is the feature that makes the result look like it was designed rather than generated.

The Frame Interpolation for slow motion and the Inpainting for object removal round out the toolkit for finishing work. The full professional browser-based editor integrates all of these into a timeline workflow rather than separate operations.