Split a image into two halves.

split.rb

#!/usr/bin/env ruby
require "fileutils"

(puts "Usage: #{File.basename $0} widthxheight"; exit 0) if ARGV.size != 1
width, height = ARGV[0].split("x").collect(&:to_i)
(puts "Please enter a valid size."; exit 0) if ((width.to_i == 0) or (height.to_i == 0))
half_width = width / 2

FileUtils.cd("images") do
  Dir['**/*'].each do |f|
    next if f == "split_image.rb"
    puts "Done processing #{f}."
    name = File.basename(f).split('.')[0]
    system("convert -crop #{half_width}x#{height}+0+0 #{name}.jpeg #{name}-1.jpg")
    system("convert -crop #{half_width}x#{height}+#{half_width}+0 #{name}.jpeg #{name}-2.jpg")
    system("mv #{name}.jpeg ../images2")
  end
end