Random Image Generator (imagemagick + ruby)

randimg.rb

#!/usr/bin/env ruby

# Script to generate random images. Based on http://www.imagemagick.org/Usage/canvas/#random_blur

require 'optparse'

options = {}

optparse = OptionParser.new do |opts|

  opts.banner = "Usage: randimg [options] [filename1] [filename2] ..."

  opts.on( '-s', '--size HxV', 'create image of size HxV (400x400 default)' ) do |size|
    options[:size] = size
  end
  options[:size] ||= "400x400"

  opts.on( '-t', '--type TYPE', 'random generator type (noise|plasma)' ) do |size|
    case size
    when 'plasma'
      options[:type] = "plasma:"
    end
  end
  options[:type] ||= "xc: +noise Random"

  opts.on( '-n', '--number NUMBER', 'number of files to create (ignores filenames)' ) do |number|
    options[:number] = number.to_i
  end

  opts.on( '-h', '--help', 'Display this screen' ) do
    puts opts
    exit
  end
end

optparse.parse!

if options[:number]
  for i in 1..options[:number]
    `convert -size #{options[:size]} #{options[:type]} 'file #{i}.png'`
  end
else
  files = (!ARGV.empty? && ARGV) || ["random.png"]
  files.each do |f|
    `convert -size #{options[:size]} #{options[:type]} #{f}`
  end
end

Thanks for the script! Good work. One thought is to replace space to underscore in file name (line 40). It will be easier to use generated files on the web.