rbur004

require 'chunky_png'
require 'zbar'

#Turns Colour PNG into 8bit BW Y800 string.
# @param image [ChunckyPNG::Image] 
# @return [String] Y800 image, as a string
def png_to_y800(image)
  y800 = ""
  (0...image.height).each do |h|
    (0...image.width).each do |w|