Get relative luminance

get-relative-luminance calculates a CSS color's relative luminance based on this definition from W3C.

It doesn't handle transparency as of yet.

Installation

$ npm install get-relative-luminance

Usage

import getRelativeLuminance from 'get-relative-luminance';
 
getRelativeLuminance('rgb(255, 255, 255)'); // 1
getRelativeLuminance('white'); // 1
getRelativeLuminance('hsl(0, 0%, 0%)'); // 0

Signature

(color: string, { ignoreTransparency:boolean = false } = {}) => number

Contributing

I appreciate your issues and PRs on Github!

Testing

yarn build && yarn test

Releasing

This project uses np.

1. Make sure your changes are in master
2. Run yarn release
3. Follow the interactive release guide