user17497: I'm having a lot of trouble making this work. I select rotobrush tool, I put my pen down on the graphics tablet and suddenly I'm painting instead of rotobrushing. Why is this happening? Also it happens again even when I try to use the mouse instead. The rotobrush tool is selected, yet the effect is paint.

user4426: The roto-brush tool is a painting process - you paint green in the areas you want to rotobrush, red in the areas you don't, then tidy up edges with the feathering tool. See example here: 



17497: <p>I'm having a lot of trouble making this work. I select rotobrush tool, I put my pen down on the graphics tablet and suddenly I'm painting instead of rotobrushing. Why is this happening? Also it happens again even when I try to use the mouse instead. The rotobrush tool is selected, yet the effect is paint.</p>
 4426: <p>The roto-brush tool <em>is</em> a painting process - you paint green in the areas you want to rotobrush, red in the areas you don't, then tidy up edges with the feathering tool. See example here: <div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/Xv_p_fzudM4?start=124"></iframe>
            </div></div></p>
