Color-hash NPM

Color Hash

Generate color based on the given string.

Demo

https://zenozeng.github.io/color-hash/demo/

Usage

Deno

import ColorHash from "https://deno.land/x/color_hash@v2.0.0/mod.ts"

Node.js

npm install color-hash

import ColorHash from 'color-hash'

const ColorHash = require('color-hash').default;

<script type="module">
import ColorHash from '../dist/esm.js';
</script>

Basic

var colorHash = new ColorHash();

// in HSL, Hue ∈ [0, 360), Saturation ∈ [0, 1], Lightness ∈ [0, 1]
colorHash.hsl('Hello World'); // [ 225, 0.65, 0.35 ]

// in RGB, R, G, B ∈ [0, 255]
colorHash.rgb('Hello World'); // [ 135, 150, 197 ]

// in HEX
colorHash.hex('Hello World'); // '#8796c5'

Custom Hash Function

var customHash = function(str) {
    var hash = 0;
    for(var i = 0; i < str.length; i++) {
        hash += str.charCodeAt(i);
    }
    return hash;
};
var colorHash = new ColorHash({hash: customHash});
colorHash.hsl('Hello World!');
colorHash.rgb('Hello World!');
colorHash.hex('Hello World!');

Custom Hue

var colorHash = new ColorHash({hue: 90});

var colorHash = new ColorHash({hue: {min: 90, max: 270}});

var colorHash = new ColorHash({hue: [ {min: 30, max: 90}, {min: 180, max: 210}, {min: 270, max: 285} ]});

Custom Lightness

var colorHash = new ColorHash({lightness: 0.5});

var colorHash = new ColorHash({lightness: [0.35, 0.5, 0.65]});

Custom Saturation

var colorHash = new ColorHash({saturation: 0.5});

var colorHash = new ColorHash({saturation: [0.35, 0.5, 0.65]});

License

MIT.

FAQ

How does it work?

It uses the hash function (default is BKDRHash) to calculate the hash of the given string.

Hue = hash % 359. (Note that 359 is a prime)
Saturation = SaturationArray[hash / 360 % SaturationArray.length]
Lightness = LightnessArray[hash / 360 / SaturationArray.length % LightnessArray.length]

By default,
SaturationArray = LightnessArray = [0.35, 0.5, 0.65]

Why not LAB?

Though LAB is more perceptually uniform, HSL is easier to control. Simply sets lightness and saturation and change hue uniformly can generate uniform colors.