NEW IN R20
Un-premultiplyPreview Basic Inputs Outputs Mask
This node is a reversal of the Premultiply Node. If color portions with the unmodified opacity of the Alpha channel were multiplied by the Premultiply Node, the Un-premultiply Node works with the opposite value of the Alpha channel to multiply the color portions. A combination of Premultiply and Un-premultiply will then restore the original color value. The input Alpha channel will also remain unchanged with Un-premultiply.