Rotoscope brush not removing

First, what are you trying to isolate? I would not use rotobrush for that shot unless you do some serious masking and color correction to improve the edge detail and contrast of the details you are trying to isolate before attempting to use the tool.

To ensure that Rotobrush does not have problems on your system, try a very simple shot like a head-and-shoulders shot of a person with a simple background.

Hey Eva,

Please go to the Composition viewer to see the changes. You're currently in Layer view. If you're happy with the Rotobrush selection, click the "Freeze" button in the Layer view to make the changes.

I recommend using the Layer Panel Video options to examine your Rotobrush selection. Here's an article for more details: https://helpx.adobe.com/in/after-effects/using/roto-brush-refine-matte.html#:~:text=Layer%20panel%20view%20options

Thanks,

Ishan

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