How unpremultiply in after effect?

I can do unpremultiplied image from images pre-multiplied in nuke.

But I can't do unpremultiplied image in after effect.

I put in place of the 32-bit parameters per channel, sRGB IEC61966 - 2.1, linearize a project workspace.

I tried to divide RGB Alpha chanel. But it makes the white edges. (Usually I do unpremuliplied images in this way in nuke)

And I tried to change the option of sequences (ignore, Straight, premultiplied) Alpha, but it doesn't work.

How to make picture unpremultiply?

Thank you

Effects--> channel--> channel shift / Channel Mixer / Whatever

Effects--> channel--> remove colorful

Mylenium

Tags: After Effects

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