Mask node

A Mask node marks part of a picture or a clip. On its own it shows nothing useful — it exists to tell another node which area to work on.

You start by describing the thing in words, or marking it once on the frame. The node works out its edges and follows it across every frame of a clip.

On a clip, you can also fix what it got wrong frame by frame. Press Edit frames, then paint the matte back in where it missed or erase where it grabbed too much. You only touch the frames that need it.

Edit frames is for clips only. On a single picture there is nothing to step through, so the button does not appear.

1. Wire your picture or clip into the node’s init input.
2. Open the Inspector and type what you want picked out, like "the person".
3. Or press Mark subject and click the thing on the frame.
4. Press Generate mask.
5. On a clip, press Edit frames and paint or erase any frame the mask got wrong.
6. Wire the result into the mask input of the node doing the change.

In the Inspector, type under Mask prompt, or use Subject (optional — precise fallback) to mark the thing: Mark subject, or Re-mark subject to do it again. Feather (edge softness) softens the edge.

Combine with another mask, once the graph has a second mask, adds, subtracts or intersects it with this one.

Output can be the mask, or the video with the mask blacked out, to hide faces before a clip goes to Seedance. Grow mask widens it over hairlines and jaws. Then press Build black-out (15 credits).

If it fails, the button says Rebuild black-out (15 credits). Start over with a new mask clears the mask so you can make a fresh one.

Plain nouns work better than descriptions. "The red car" finds a car; "the vehicle in the middle distance on the left" often finds nothing.