Match the color of your Hue lights to what you are seeing on your Mac's screen

hue_screen.rb

require 'hue'
require 'RMagick'
require 'ColorMath'

$path = "tmp/out.jpg"
$client = Hue::Client.new
def lights(h,s,l)
  $client.lights.each do |light|
    light.on!
    light.hue = ((h/360)*65535).round
    light.saturation = (s*255).round
    light.brightness = (l*255).round
  end
end

def get_color(path)
  img =  Magick::Image.read(path).first
  pix = img.scale(1, 1)
  avg_color_hex = pix.to_color(pix.pixel_color(0,0))
  return avg_color_hex
end

def screen_capture(path)
  `screencapture #{path}`
end

while 1
  screen_capture($path)
  color = ColorMath::hex_color(get_color($path)[0,7])
  lights(color.hue, color.saturation, color.luminance)
end