Premultiply

What is it about?

This page describes the Premultiply node of the classic node materials in Cinema 4D. It multiplies RGB values by the alpha channel — the format conversion needed for correct compositing of transparent elements.

The Pre-Multiply Node can be used to adjust color values according to an existing Alpha channel.

This Node modifies the color values according to the opacity of the Alpha channel. The brightness in the Alpha channel will be multiplied using the individual RGB color portions. If no Alpha channel is present, the color values will remain unchanged.