@sammachin/node-red-colour-convert 0.1.0

A Node-RED node to convert colours between RGB, HSL and CIE xy

npm install @sammachin/node-red-colour-convert

@sammachin/node-red-colour-convert

A Node-RED node that converts a colour between RGB, HSL and CIE xy, and outputs every representation in msg.payload.

Install

From your Node-RED user directory (~/.node-red):

npm install @sammachin/node-red-colour-convert

Or install from a local checkout:

cd ~/.node-red
npm install /path/to/node-red-colour-convert

Usage

Drop the colour convert node into a flow, then choose which colour space the incoming value is in and supply the value. Whatever you provide is converted into all three representations.

Configuration

Accepted value formats

• RGB — "255,100,0", hex "#ff6400" (or "#f60"), {r:255,g:100,b:0}, or [255,100,0]. Channels are 0–255.
• HSL — "30,100,50", {h:30,s:100,l:50}, or [30,100,50]. H is 0–360, S and L are 0–100.
• CIE xy — "0.64,0.33", {x:0.64,y:0.33}, or [0.64,0.33]. An optional third value is the Y luminance (0–1); without it the colour is returned at full brightness.

Output

msg.payload is set to an object containing every representation:

{
  "rgb": { "r": 255, "g": 100, "b": 0 },
  "hex": "#ff6400",
  "hsl": { "h": 24, "s": 100, "l": 50 },
  "xy":  { "x": 0.6008, "y": 0.3663, "Y": 0.2416 }
}

CIE xy conversions use the sRGB colour space with a D65 white point, which is the convention used by most smart-home colour lights (Philips Hue, Matter, Zigbee).

Licence

MIT