ℹ️ For GraphicsMagick version please see tag v0.2.1.

colour-extractor

Extracts colour palettes from photos using k-means clustering in LAB color space.

Installation

Is as simple as with any other Node.js module:

$ npm install @colour-extractor/colour-extractor

Note: The module contains precompiled Rust libraries. Please open an issue if your platform isn't supported.

Usage

colour-extractor exports two functions:

const { topColours, topHexColours } = require('colour-extractor');
const colors = await topColours('Photos/Cats/01.jpg');
// => [ [158, 64, 75], ... ]
console.log(colors);

topColours function needs a path to your photo (see below for supported formats), which resolves with an Array with RGB triplet for each prominent colors:

[
  [46, 70, 118],
  [0,   0,   2],
  [12,  44,  11]
]

topHexColours works the same, but instead of an RGB triplet it returns hex codes (with # included).

[
    '#2e4676',
    '#000002',
    '#0c2c0b'
]

Supported image formats

All major image formats are supported, including PNG, JPG and WebP. Please see image's readme for a full list.

How does it work?

Here's the simplified algorithm:

1. Image is scaled down to 48x48px with a fast nearest-neighbour algoritm.
2. Colors are gruped into up to 16 clusters using k-means clustering.
3. Identified clusters are refined using CIEDE2000 distance.

License

colour-extractor is published under MIT license.

Photos used in the sample can be found on Unsplash:

• https://unsplash.com/photos/7QaYj09Wbhs
• https://unsplash.com/photos/pPRT4CLykp8
• https://unsplash.com/photos/ttF84ygvliI