pngquant script

quantizator.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'
require 'png_quantizator'
require 'tempfile'

speed = ENV['SPEED'] || 1
ARGV.each do |png_path|
  puts "Processing #{png_path}..."
  file = PngQuantizator::Image.new(png_path)
  old_size = File.size(png_path)

  tempfile = Tempfile.new('pngquant')
  file.quantize_to(tempfile.path)
  new_size = File.size(tempfile.path)

  percentage = 100.0 * new_size / old_size
  if percentage < 80
    puts "We can make it smaller, we have the technology!"
    File.open(png_path, 'w') { |f| f << File.read(tempfile.path) }
    puts "Shrunk to #{percentage.round(2)}% the size"
  else
    puts "Not shrinking (would only be #{percentage.round(2)}% the size)"
  end
end