# File lib/png.rb, line 573
    def to_s
      image = []
      scale = (@width / 39) + 1

      @data.each_with_index do |row, x|
        next if x % scale != 0
        row.each_with_index do |color, y|
          next if y % scale != 0
          image << color.to_ascii
        end
        image << "\n"
      end

      return image.join
    end