# File lib/native_file_types/apple2/PackedAppleDosPic.rb, line 12
  def unpacked_picture_bytes
    
#    puts @@scanline_offsets.length
    packed_buffer=data_without_header
    unpacked_buffer="\000"*8192
    p=0
    parity=1
    row=1
    column=0
    done=false
    while !done do
      b=packed_buffer[p]
      if b==0 then          
        run_length=packed_buffer[p+1]
        colour=packed_buffer[p+2]
        p+=2
      else
        run_length=1
        colour=b
      end
      run_length.times do |i|
        destination_offset=@@scanline_offsets[row]+column
        unpacked_buffer[destination_offset]=colour
        row+=2
        if row>=192 then
          row=parity
          column+=1
          if column>=40 then
            if parity==0 then
              done=true
            else
              row=0
              column=0
              parity=0
            end
          end
        end
      end
      p+=1
      done=true if p==packed_buffer.length
    end
    
    unpacked_buffer
  end