Unpremult node

This documentation is for version 2.0 of Unpremult (net.sf.openfx.Unpremult).

Description

Divide the selected channels by alpha (or another channel)

If no channel is selected, or the premultChannel is set to None, the image data is left untouched, but its premultiplication state is set to UnPreMultiplied.

See also: https://web.archive.org/web/20210413043727/http://opticalenquiry.com/nuke/index.php?title=Premultiplication

Inputs

Input	Description	Optional
Source		No

Controls

Parameter / script name	Type	Default	Function
Plane / inputPlane	Choice	Color.RGBA	The plane channels to premult Color.RGBA (uk.co.thefoundry.OfxImagePlaneColour) DisparityLeft.Disparity (uk.co.thefoundry.OfxImagePlaneStereoDisparityLeft) DisparityRight.Disparity (uk.co.thefoundry.OfxImagePlaneStereoDisparityRight) Backward.Motion (uk.co.thefoundry.OfxImagePlaneBackMotionVector) Forward.Motion (uk.co.thefoundry.OfxImagePlaneForwardMotionVector)
By / premultChannel	Choice	Color.A	The channel to use for (un)premult. Color.R (uk.co.thefoundry.OfxImagePlaneColour.R): R channel from input Source Color.G (uk.co.thefoundry.OfxImagePlaneColour.G): G channel from input Source Color.B (uk.co.thefoundry.OfxImagePlaneColour.B): B channel from input Source Color.A (uk.co.thefoundry.OfxImagePlaneColour.A): A channel from input Source 0: 0 constant channel 1: 1 constant channel
All Planes / processAllPlanes	Boolean	Off	When checked all planes in input will be processed and output to the same plane as in input. It is useful for example to apply a Transform effect on all planes.
Clip Info… / clipInfo	Button		Display information about the inputs