dominant-color/index.js

Gets the dominant color of an image.

var im     = require('imagemagick')

module.exports = function(path, opts, next){
  if (typeof opts === 'function'){
    next = opts
    opts = undefined
  }
  if (!next) next = function(){}
  if (!opts) opts = {}
  if (!opts.format) opts.format = 'hex'

  var imArgs = [path, '-scale', '1x1\!', '-format', '%[pixel:u]', 'info:-']

  im.convert(imArgs, function(err, stdout){
    if (err) next(err)
    var rgb = stdout.substring(stdout.indexOf('(') + 1, stdout.indexOf(')'))

    var results = {
      hex: function(){ return require('rgb-hex').apply(this, rgb.split(',')) },
      rgb: function(){ return rgb.split(',') }
    }

    next(null, results[opts.format]())
  })
}