Alpha channel White border

[jaychoi]

I have been trying to get rid of this white border of the alpha channel in my scene.

I have saved the file as .exr for animation purpose.

 

Here's what I have tried;

F8 -> background : black (turned off the sky)

config -> rendering -> use environment Alpha

turned off filtering in my VrayAlpha Channel.

It still give me the white border.

 

What should I do?

 

Thanks in advance!