crush and resize book images

gistfile1.rb

#! /usr/bin/env ruby
require 'rubygems'
require 'oily_png'

Dir.glob("book/**/*.png").each do |file|
  puts file
  image = ChunkyPNG::Image.from_file(file)
  p image.width
  p image.height
  if image.width > 800 || image.height > 800
    if image.width > image.height
      `convert -resize 800x #{file} #{file}.smaller.png`
    else
      `convert -resize x800 #{file} #{file}.smaller.png`
    end
    `pngcrush #{file}.smaller.png #{file}`
    `rm #{file}.smaller.png`
  end
end

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