# File lib/color/grayscale.rb, line 140
  def to_yiq
    y = @g
    i = (@g * 0.596) + (@g * -0.275) + (@g * -0.321)
    q = (@g * 0.212) + (@g * -0.523) + (@g *  0.311)
    Color::YIQ.from_fraction(y, i, q)
  end