optimize all png and jpeg inside the actual directory

.rb

# image_optimizer requires availability of
# - pngquant 
# - optipng 
# - jpegoptim
require "image_optimizer"
require 'parallel'

def image?(file)
  file =~ /\.(jpe?g|png)$/
end

files = `find`.split("\n").filter do |file|
  image?(file)
end

def optimize(files)
  files.each do |f|
    # quality is measure for jpeg, level is the measure for png
    ImageOptimizer.new(f, quality: 80, level: 3).optimize
  end
end
Parallel.map(files.each_slice(10).to_a, in_processes: 6) { |f| optimize(f) }