make an animated gif from some jpegs with RMagick

gif-ify.rb

#!/usr/bin/env ruby

require "RMagick"

RESIZE = 0.25
DELAY = 10
FILENAME = "quartz-composer-process.gif"

puts "loading image files"

files = Dir.glob('*.jpg')

if files.length < 1
  puts "no images files found--exiting."
  exit
end

anim = Magick::ImageList.new(*files)

puts "animating #{anim.length} files"

puts "setting delay to #{DELAY} and resize scale to #{RESIZE}"
anim.each {|i| i.delay = DELAY; i.resize!(RESIZE)}; 

puts "outputting as #{FILENAME}"
anim.write(FILENAME)

not flexible at all at the moment! for instance, the Dir.glob value is hardcoded.