Drawn mask snapping to predefined areas

[Ian Liuzzi-fedun]

Would always help if the image I was talking about was attached.

[Todd Kopriva]

How, exactly, are you drawing the mask? What I see in your screenshot looks like the segmentation boundary from the Roto Brush tool, which has nothing to do with masks.

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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[Ian Liuzzi-fedun]

According to After Effects what is being shown is the alpha boundary. I tried to redraw it with a tool but it always sticks to what is shown. I beleive the images that imported (that graphic is one image) had an alpha channel with it and After Effects is using that. Is there a way to get it to ignore the alpha on the file?

[Todd Kopriva]

Again, how exactly are you drawing the mask?

Are you using the Pen tool?

As I said, it appears that you are using the Roto Brush tool, and that has nothing to do with masks.

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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[Ian Liuzzi-fedun]

I have tried the pen and rectangle tool. If I draw a mask I get the attached:

Perhaps I am asking the wrong question. Perhaps whoever did this for me did use the rotobrush tool. Either way anything outside of the purple line becomes part of the alpha channel and therefore is faded out when over video – I do not want this.

[William Scholik]

Here is a good place to start with masks. This is much better than any help that I could give you through a forum.

https://library.creativecow.net/devis_andrew/AE_Creating-Masks/1

“We cannot solve our problems with the same thinking we used when we created them.”
― Albert Einstein

[Ian Liuzzi-fedun]

So I’ve done some additional research and it does appear that we are talking about the rotobrush. Once again when these files are imported into After Effects they have this alpha channel which I’m presuming the rotobrush is taking so I’m wondering if we can tell After Effects to ignore it.