chromatism/src/operations/sepia.js

A simple set of utility functions for colours.

import makeColourObject from './convert'
import convert from '../helpers/convert-to-type'

export default function sepia (colourRef) {
  var colour = convert('rgb', colourRef)

  var newcolour = {}
  newcolour.r = (colour.r * 0.393) + (colour.g * 0.769) + (colour.b * 0.189)
  newcolour.g = (colour.r * 0.349) + (colour.g * 0.686) + (colour.b * 0.168)
  newcolour.b = (colour.r * 0.272) + (colour.g * 0.534) + (colour.b * 0.131)

  return makeColourObject(newcolour)
}