color-thief.js

var ColorThief = require('color-thief-jimp');
var Jimp = require('jimp');

Jimp.read(imageFilepathOrUrl, (err, sourceImage) => {
  if (err) {
    console.error(err);
    return;
  }

  var dominantColor = ColorThief.getColor(sourceImage);
  // dominantColor = [intRed, intGreen, intBlue]
  
  var palette = ColorThief.getPalette(sourceImage, 8);
  // palette = [ [intRed, intGreen, intBlue], [intRed, intGreen, intBlue], ... ]
});