Compositing node

Set Alpha

Replaces the alpha channel outright with the brightness of a second image you patch in: a hand-drawn matte, a Shape, a Ramp, or another branch's Show Alpha. With nothing in the second input, the picture is forced fully opaque.

Download the patch Read it in the Field Guide

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

What it does

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

Try it

Patch a Ramp into the second input to fade a photo out from left to right.

Image Source Set Alpha (Ramp)Output

Inputs and outputs

Inputs

picture input
picture input 2

Outputs

picture out

Example patch

This patch wires Set Alpha 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
# Set Alpha: a starting patch for the Set Alpha node
node 1 Compositing set alpha
  id node
  pos 520 300
end
node 2 Source Ramp
  id in0
  pos 0 220
end
node 3 Source Ramp
  id in1
  pos 0 510
end
node 4 Utility Output
  id out
  pos 1080 300
end
cable node 0 in0
cable node 1 in1
cable out 0 node