Compositing node
Alpha Levels
The Levels remap, applied to the alpha channel only. Low and High clamp and stretch the matte's range (choking a soft edge tighter, or spreading it wider) and Gamma bends the falloff in between. The go-to cleanup pass after Chroma Key or Alpha from Luma.
What it does
Alpha Levels is a compositing node: it layers, masks and routes pictures. It takes picture in and gives picture out.
Try it
Raise Low a touch after a key to remove the faint haze left around a subject.
Inputs and outputs
Inputs
- picture input
Outputs
- picture out
Controls
Every control with a range can be driven by a modulator, a note, an audio level or a sketch.
| Control | Range or options | Default |
|---|---|---|
| low | 0 to 1 | 0 |
| high | 0 to 1 | 1 |
| gamma | 0.1 to 4 | 1 |
Example patch
This patch wires Alpha Levels 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 Levels: a starting patch for the Alpha Levels node
node 1 Compositing alpha levels
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