Geeting Rid Of Line Between Masks

[jimlolo]

I have a video where half of it needs a different Effect than the other. So I drew a tracking mask in Mocha, splitting the video into 2 halves. Back in AE, each 1/2 is in a different layer (1 I applied the Matte, the other I inverted the Matte).

But when the 2 layers combine in the output, there is a black (blending?) line where the 2 halves meet. In Mocha I used edge width of 0 and 1, but that line still is seen.

Any idea how to get rid of it so the 2 halves fit together without a border line?

Thanks.

[Roland Kahlenberg]

Use the Blending Mode, Alpha Add.
Alternatives are —
1) Effect>Channel>Minimax; where you can set Channel to Alpha & Color and then set Radius to 1.

2) Increase the Mask Expansion property by 1

HTH

[jimlolo]

Thanks. None seems to work tho. Using the Minimax option messes up the border elsewhere on the layer where there are other transparent borders. I can't find Mask Expansion option with the Mocha Matte. And blend mode didn't do it. Any further ideas?

[Roland Kahlenberg]

What else is happening in the Comp and/or Layers?

For a quick tryout, look for the Minimax effect in the Timeline. Expand its properties and click on the "+" next to Compositing Options. This will force Minimax to work only with the Mask selected with the Mask Reference Dropdown Menu.

[OussK]

Try to apply a third layer underneath so it can cover that is and since it's one pixel so it can be same as the Layer A or Layer B

anyway try to post some screenshots so we can get better idea 

[Rick Gerard]

Expand one of the masks by 1 or 2 pixels, or expand the mask by half of the feather value if you added a feather. You should also use the Alpha Add blend mode on both layers that have masks. 

[jimlolo]

I think I may have it, except on multiple masks - I have a mask from Mocha tracking that I use to remove an area; I have another regular AE mask (I drew in) that removes a separate, non-overlapping area on the same layer. Seems if I have the mocha mask, the other mask doesn't apply. How can I get both of them to remove their respective areas?

Thanks.