5 Replies Latest reply on Apr 9, 2017 11:27 PM by Roei Tzoref

    Help with roto-brush


      I use the toggle alpha boundary to rotobrush my mask in after effects but when I grab the hand tool to move the clip the toggle alpha boundary go into a solid color.

      I don't know why it doing this.



        • 1. Re: Help with roto-brush
          Roei Tzoref Adobe Community Professional

          yes, it's a bug ever since CC2015 that relates to when hardware acceleration is turned On in the preferences->display.


          as of CC2015, using Alpha Boundary or Alpha Overlay in the layer panel when viewing masks shows 100% fill background in the overlay color when hardware acceleration is turned On, so just turn it off.

          • 2. Re: Help with roto-brush
            BabyKittyShadow Level 1

            Thank you so much

            • 3. Re: Help with roto-brush
              Rick Gerard Adobe Community Professional & MVP

              Your problem may be a bug but for others that run into this problem here's how the Rotobrush Preview options work.


              The icons at the bottom of the Layer Panel when you have the Rotobrush tool selected are options for previewing the selection. The first gives you an alpha channel view which is black and white. The second gives you an outline. The third which gives you a solid color background but if you have the opacity set to 100% and you pick a hot color you can also get what you are seeing. This info is in the help files and anyone using Rotobrush should take the time to learn how to use the tool. Rotobrush doesn't work as you think it would and the ON stage for these three little icons is awfully subtle. Even experienced users have been caught using the wrong option


              Here's mine set to green at 25%...

              Screen Shot 2017-04-08 at 10.49.56 PM.png

              1 person found this helpful
              • 4. Re: Help with roto-brush
                BabyKittyShadow Level 1

                It was the bug but thank you anyways.

                • 5. Re: Help with roto-brush
                  Roei Tzoref Adobe Community Professional

                  good pointers Rick, after examining Op's composition window you can see that the alpha boundary view is active

                  and it is set by default to 100%. it is supposed to show only the border and not all the alpha like the next up to the right Alpha Overlay mode


                  this is when alpha boundary is not active, and the alpha overlay is active instead. it is set at default at 50%.