# File lib/color/rgb.rb, line 317
  def adjust_hue(percent)
    percent  /= 100.0
    percent  += 1.0
    percent  = [ percent, 2.0 ].min
    percent  = [ 0.0, percent ].max

    hsl      = to_hsl
    hsl.h   *= percent
    hsl.to_rgb
  end