# File lib/color/rgb.rb, line 187
  def to_yiq
    y = (@r * 0.299) + (@g *  0.587) + (@b *  0.114)
    i = (@r * 0.596) + (@g * -0.275) + (@b * -0.321)
    q = (@r * 0.212) + (@g * -0.523) + (@b *  0.311)
    Color::YIQ.from_fraction(y, i, q)
  end