HueKeyer node — Natron 2.5.0 documentation

# HueKeyer node

This documentation is for version 2.0 of HueKeyer (net.sf.openfx.HueKeyer).

## Description

Compute a key depending on hue value.

Hue and saturation are computed from the the source RGB values. Depending on the hue value, the various adjustment values are computed, and then applied:

amount: output transparency for the given hue (amount=1 means alpha=0).

sat_thrsh: if source saturation is below this value, the output transparency is gradually decreased.

## Inputs

Input | Description | Optional
--- | --- | ---
Source |  | No

## Controls

Parameter / script name | Type | Default | Function
--- | --- | --- | ---
Hue Curves / `hue` | Parametric | amount: sat_thrsh: | Hue-dependent alpha lookup curves: amount: transparency (1-alpha) amount for the given hue sat_thrsh: if source saturation is below this value, transparency is decreased progressively.