[header] How to use the roto brush in adobe ae [title] Import your footage into ae. [step] Make sure that the preview resolution is set to " full " so that you can clearly make out the details of your subject, which will ensure the accuracy of your rotobrushing. [title] Select the rotobrush tool. 
[step] Double-click your footage to open the layer panel. At the top of the layer panel is the roto brush icon.