class Bitmap
	def invert
		self.process_color do |color_arr|
			color_arr.size.times do |i|
				color_arr[i].red = 255-color_arr[i].red
				color_arr[i].green = 255-color_arr[i].green
				color_arr[i].blue = 255-color_arr[i].blue
			end
		end
		self
	end
end