HSLuv - Human-friendly HSL

Installation

Install from NPM package repository:

npm install hsluv

ES modules:

import {Hsluv} from "hsluv";

CommonJS:

const {Hsluv} = require("hsluv");

HTML include:

• Download the latest hsluv.min.js
• Add <script src="hsluv-x.x.x.min.js"></script> to your HTML
• Access it via the global window.Hsluv

Usage

The API is designed to avoid heap allocation. The HSLuv class defines the following public fields:

• RGB: hex:String, rgb_r:Float [0;1], rgb_g:Float [0;1], rgb_r:Float [0;1]
• CIE XYZ: xyz_x:Float, xyz_y:Float, xyz_z:Float
• CIE LUV: luv_l:Float, luv_u:Float, luv_v:Float
• CIE LUV LCh: lch_l:Float, lch_c:Float, lch_h:Float
• HSLuv: hsluv_h:Float [0;360], hsluv_s:Float [0;100], hsluv_l:Float [0;100]
• HPLuv: hpluv_h:Float [0;360], hpluv_p:Float [0;100], hpluv_l:Float [0;100]

To convert between color spaces, simply set the properties of the source color space, run the conversion methods, then read the properties of the target color space.

Use the following methods to convert to and from RGB:

• HSLuv: hsluvToRgb(), hsluvToHex(), rgbToHsluv(), hexToHsluv()
• HPLuv: hpluvToRgb(), hpluvToHex(), rgbToHpluv(), hexToHpluv()

Use the following methods to do step-by-step conversion:

• Forward: hsluvToLch() (or hpluvToLch()), lchToLuv(), luvToXyz(), xyzToRgb(), rgbToHex()
• Backward: hexToRgb(), rgbToXyz(), xyzToLuv(), luvToLch(), lchToHsluv() (or lchToHpluv())

For advanced usage, we also export the bounding lines in slope-intercept format, two for each RGB channel representing the limit of the gamut.

• R < 0: r0s, r0i
• R > 1: r1s, r1i
• G < 0: g0s, g0i
• G > 1: g1s, g1i
• B < 0: b0s, b0i
• B > 1: b1s, b1i

Example:

var conv = new Hsluv();
conv.hsluv_h = 10;
conv.hsluv_s = 75;
conv.hsluv_l = 65;
conv.hsluvToHex();
console.log(conv.hex); // Will print "#ec7d82"

Also available for Stylus. See here.

Development

Our GitHub Actions workflow will build and test every push and PR to the main branch. When a main branch receives a commit that updates the project version in package.json, the workflow will tag the commit, create a draft release on GitHub and publish the npm package. Mark your versions with the -rc suffix to create pre-releases.

Changelog

1.0.1

• Fix TypeScript d.ts resolution for certain configurations.

1.0.0

• New API to avoid heap allocation.
• Transpiled from hsluv-haxe and converted manually to TypeScript.
• New GitHub Actions CI for build, test and publishing automation.

0.1.0

• Provide Typescript definitions in the NPM package.

0.0.3

• Expose intermediate functions in the public API.

0.0.2

• Improve packaging and minification.

0.0.1

• Initial release under the name HSLuv. Old releases can be found here.