MMV masking problem (vegaspro 14)

[fugu wa]

okay so.
i'm working on my mmv, and if i mask the mouth it seems to be fine in the preview window, but after rendering the masking line will show up.
it helped a little bit when i made the section little bit bigger and blurred the edges, but in some parts i cannot do that and the harsh line will show up.

what causes this
for example if i mask a hand. and then fingers separately. then i move the fingers the way i want. but after i have rendered i can see the masking
pls help

[Kireblue]

Adding a small feather to the mask should fix it. Even setting the feather amount to 0.3% should be enough, but you'll have to remember to set it to each individual frame.

[fugu wa]

Adding a small feather to the mask should fix it. Even setting the feather amount to 0.3% should be enough, but you'll have to remember to set it to each individual frame.

thank you for your reply. and yes i did that. and yeah it helps a litttle bit... but it won't remove the problem. after i add color correct or some other color stuff the lines will show up even more

and i cannot add feather to the all parts ;-; for example. if i mask the head. i can't add feather to it cause otherwise
u know it will add the feather to the hair and then the background shows up

also sorry my english is bad :/

[Kireblue]

can you post a screenshot of the issue?

[BecauseImBored1]

okay so.
i'm working on my mmv, and if i mask the mouth it seems to be fine in the preview window, but after rendering the masking line will show up.
it helped a little bit when i made the section little bit bigger and blurred the edges, but in some parts i cannot do that and the harsh line will show up.

what causes this
for example if i mask a hand. and then fingers separately. then i move the fingers the way i want. but after i have rendered i can see the masking
pls help

I made my MMV in vegas and just making sure are you doing overlap masks? Or is the visible background the spaces in between body part masks?