Premultiply or Unpremultiply

Premultiply or Unpremultiply

Status:

Maintained

Keyframes:

Yes

Source library:

frei0r

Source filter:

premultiply

Available:

On Master only:

No

Known bugs:

No

Description

Multiply (or divide) each color component by the pixel’s alpha value.

Use this effect before any alpha effects if the result of your compositions using alpha has odd-looking colors.

Parameters

Parameter	Value	Description
unpremultiply	Switch	Whether to unpremultiply instead (default is On)

Notes

For more details see this article by Nvidia about Alpha Blending.