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Black line around mask

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Kar BonBlack line around mask
by on Feb 10, 2016 at 12:45:14 pm

Hello all !

On a video made with Keyshot, I want to place a towel around a blade.

To do so, half of the towel should be behind the blade, and the other half should be in front of it.

To do so, I have created one "addition" mask on the blade. I then copied the layer containing the addition mask and paste it.
On the paste layer, I changed the mask from addition to "subtraction". The shape and movement of both masks are thus exactly the same.

Here are pictures of the addition and subtraction masks.

But there's a problem. On AE composition and on the rendered video, I get this black line around the blade.

How could I remove it, or at least make it less visible ?

Thank you very much in advance.

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Cassius MarquesRe: Black line around mask
by on Feb 10, 2016 at 12:51:08 pm

have you tried to choke the layer by some fractions of a pixel? (simple choker effect for ex.)

Cassius Marques

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Kar BonRe: Black line around mask
by on Feb 10, 2016 at 1:05:54 pm

Thanks for your answer Cassius !

I actually found out why there's a line around the blade. I kept the addition mask but I deleted the subtraction mask (kept the layer though).

I don't know why I used subtraction mask actually, now it works !

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Sean McGarryRe: Black line around mask
by on Oct 26, 2016 at 9:08:27 pm

In my case I had an effect on the video or photo layer and when I tried to mask out a section it left a thin dark line around parts of the mask. I fixed this by pre composing the video with all attributes included, then applied the mask to the pre-comp.

Hope that saves someone some time...

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