a mask and its invert are not creating the whole layer-after effects

New Here ,
Mar 14, 2022 Mar 14, 2022

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I'm new to after effects.

Suppose that we have a solid layer. create a rectangle mask with blending mode set to Add. duplicate this solid layer and invert the mask in this layer. now we have something like this:

bandicam 2022-03-14 13-41-17-211.jpg

we have transparent space/crack along the mask path. these is no mask feather that can cause this problm. I set preview resoloution to quarter so it becomes easier to see. I know that this problem could be solved by expanding one or both masks.

my question is why this is happening? and how to fix it without expanding masks?

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Adobe Community Professional , Mar 14, 2022 Mar 14, 2022
Thios is to be expected. AE's default transparency blending is not linear and semi-transparent values do not add up to 100%. You need to change the layer blending mode to Alpha Add or treat the transparency with Matte Choker or a channel effect. Mylenium

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Adobe Community Professional ,
Mar 14, 2022 Mar 14, 2022

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Thios is to be expected. AE's default transparency blending is not linear and semi-transparent values do not add up to 100%. You need to change the layer blending mode to Alpha Add or treat the transparency with Matte Choker or a channel effect.

 

Mylenium

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