# File lib/captcha.rb, line 165
    def populate_with_noise
      color = colorResolve( 0, 0, 0 )

      ( width * height / 4 ).times do
        x, y = rand( width ), rand( height )
        setPixel( x, y, color )
      end

      inc = height/10
      ( height / inc ).times do |i|
        line( 0, inc*i + rand(20) - 10, width, inc*i + rand(20) - 10, color )
      end
    end