Compositing node

Alpha Invert

Swaps transparent for solid and back, and leaves the colour alone. It is the invert-matte switch a key would otherwise need a second node to get.

Download the patch Read it in the Field Guide

The Alpha Invert node in Infinite, showing its inputs, controls and outputs.

What it does

Alpha Invert is a compositing node: it layers, masks and routes pictures. It takes picture in and gives picture out.

Try it

Invert a Luma Key to keep the dark parts of a shot instead of the bright ones.

Video Luma Key Alpha Invert Output

Inputs and outputs

Inputs

picture input

Outputs

picture out

Example patch

This patch wires Alpha Invert to what it needs and shows the result. Download it, then use File, Open in Infinite, or read it here: it is plain text.

infinite-patch 1
rev 2
# Alpha Invert: a starting patch for the Alpha Invert node
node 1 Compositing alpha invert
  id node
  pos 520 300
end
node 2 Source Ramp
  id in0
  pos 0 300
end
node 3 Utility Output
  id out
  pos 1080 300
end
cable node 0 in0
cable out 0 node