contrast

Determine if the given color is light or dark.

This is useful for dynamically deciding which color a foreground color should be when placed over a given background color.

Install

npm install contrast --save

Usage

var contrast = require('contrast');
 
var el = document.querySelector('#some-element');
var bgColor = e.style.backgroundColor;
 
if (contrast(bgColor) === 'light') {
  textColor = '#000';
}
else {
  textColor = '#fff'
}
 
el.style.color = textColor;

Run Tests

npm install
npm test