Glitch PNG with ChunkyPNG

png.rb

require 'zlib'
require 'chunky_png'
p = ChunkyPNG::Datastream.from_file(ARGV.first)
a = p.data_chunks.inject('') { |b, c| b + c.content }
d = Zlib::Inflate.new().inflate(a)
d.gsub!(/0/, '1')
e = Zlib::Deflate.deflate(d)
p.data_chunks = [ChunkyPNG::Chunk::ImageData.new('IDAT', e)]
p.save('./out.png')