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ROTO BRUSH TOOL doesn't work

Community Beginner ,
Oct 15, 2017 Oct 15, 2017

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Hello, I want to use roto brush tool, but it doesn't work. When I choose roto brush tool and start selecting what I want, the whole video border turns purple, meaning the whole image is selected. I don't know what I need to do, to just select what I want.

Any suggestions?

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correct answers 1 Correct answer

Adobe Community Professional , Oct 16, 2017 Oct 16, 2017
So I took a screenshot of your screenshot and as I suspected there are very few contrast and color differences in your footage for Rotobrush to work with. I didn't get the entire frame but when I tried to mask out the left leg there was so much of the image selected using the default Rotobrush settings that I could tell that Rotobrush would have a very hard time finding edges. The solution is to do some color correcting before you try and use Rotobrush. My first choice was to add Black and White...

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Adobe Community Professional ,
Oct 15, 2017 Oct 15, 2017

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The Roto Brush tool should work as expected.

Resetting your preferences is probably the quiickest way to restore the tool.

If on Mac, hold command option shift when you start AE.  If on Windows, hold control alt shift.  You should get a dialog box asking if you want to reset your preferences.  Choose Yes.

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Adobe Community Professional ,
Oct 15, 2017 Oct 15, 2017

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Without knowing what your footage looks like, nobody can tell you much. Presumably the footage simply doesn't have enough contrast to allow the tool to detect any edges, but who's to say? You'd have to provide at least a screenshot.

Mylenium

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Community Beginner ,
Oct 16, 2017 Oct 16, 2017

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Warren Heaton: I did as you say, but it still doesn't work.

Mylenium: Here is screeonshot. I tried on another video where I know edges are better, but it still didn't work. I tried some things, and I click on the icon I marked with red (set IN point...), and then this one frame where I click it, it choose what I want. But then another frame not anymore. I know this isn't right way to do it, but I guess it shows there are enough edges. So I really don't know what to do.

roto brush.png

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Adobe Community Professional ,
Oct 16, 2017 Oct 16, 2017

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As a start, try working at 100% zoom and full resolution. This may merely be an issue with the effect operating on the reduced res.

Mylenium

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Adobe Community Professional ,
Oct 16, 2017 Oct 16, 2017

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So I took a screenshot of your screenshot and as I suspected there are very few contrast and color differences in your footage for Rotobrush to work with. I didn't get the entire frame but when I tried to mask out the left leg there was so much of the image selected using the default Rotobrush settings that I could tell that Rotobrush would have a very hard time finding edges. The solution is to do some color correcting before you try and use Rotobrush. My first choice was to add Black and White and really jack the values around. It became much easier to cut out the left leg. When you have the roto completed, propagated and frozen, then you can turn off the color correction or just delete it. I hope this helps.

Screen Shot 2017-10-16 at 8.00.03 AM.png

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Community Beginner ,
Oct 20, 2017 Oct 20, 2017

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Thank you both for help. I realized now, that I can't use Rotobrush if I open video in AE as "replace with AE composition" from Premiere Pro. But if I import video in AE then I can use it.

And thank you Rick, I do it your way, and it works. Thank you.

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New Here ,
Jan 12, 2020 Jan 12, 2020

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do you mean it's better to render the clip from Premiere Pro and then import in to AE?

 

When I replace video with AE composition in PP, use the Rotor brush toll and then quit out, an error witht the clip happends and goes red screen in view finder. Any ideas why?

 

Could it be an issue where I'm using a fps clip in a 24fps timeline?

 

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New Here ,
Jul 28, 2020 Jul 28, 2020

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Not working, Would you explain it how you did it?

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New Here ,
Aug 09, 2020 Aug 09, 2020

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I had the same exact issue. Just change the comp framerate to the actual framerate of the source clip and you be able to roto your subject.

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New Here ,
May 02, 2021 May 02, 2021

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I'm having that issue, but can't adjust the framerate of the composition. I work with a lot of stop-motion footage of varying framerates, but edit my compositions in 25fps. Pre-composing the footage before trying to roto it doesn't help.

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New Here ,
Jun 05, 2018 Jun 05, 2018

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worthless again

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New Here ,
Jan 30, 2021 Jan 30, 2021

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It steel doesn't work for me:( 

I am trying to mask but only the outline goes purple and masked:/ 

PLEASE help me , I've been trying for days to fix it.

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New Here ,
Apr 06, 2021 Apr 06, 2021

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I'm having the same problem, but instead of the borders being purple I am not allowed to mask out anything. Please help.

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New Here ,
Aug 06, 2021 Aug 06, 2021

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LATEST

Hey this just happened to me, same purple box around all of the footage in the layer edit panel. I also have footage with a limited amt of contrast, but I find that the RotoBrush (2.0) will still do a pretty good job of pulling something out of the footage, not simply producing a big purple square around the whole frame of the footage. 
I realized my footage and composition framerates were off. Footage was 23.976, comp was at 30. I got an error in the bottom of the layer edit panel that said as much. After changing the composition fps to 23.976 in composition settings,  I tried the RotoBrush again. The error went away, but still the full purple square. 
I deleted my footage from the timeline and re-imported it into the comp from the project panel with the matching fps (footage, 23.976 / Comp @ 23.976), and voila! The RotoBrush performed as expected. Now to adjust that contrast... 

Just my 2 cents!  

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