Make a custom Kim Jong Il funeral procession image

jongify.rb

# Create your very own Kim Jong Il funeral magic!
# Requires ImageMagick.
#   OS X:   brew install imagemagick
#   Ubuntu: sudo apt-get install imagemagick
# 
# Background image from Dustin Fenstermacher via http://gawker.com/5871682/give-yourself-a-dictators-funeral-with-this-kim-jong+il-photoshop-template

abort 'usage: jongify.rb image_file' unless ARGV.size == 1
original_image = ARGV[0]

# D/L the background image
unless File.exist?('kimjong.jpg')
  `curl http://i.imgur.com/yFtW7.jpg > kimjong.jpg` 
end

# Create the mask image
unless File.exist?('mask.jpg')
  `convert -size 960x716 xc: -draw 'polygon 213,53 524,60 524,443 215,451' -negate mask.jpg`
end

# Resize the source image 
size = `identify -format "%w,%h" #{original_image}`.split(',')
org_width = size[0].to_f
org_height = size[1].to_f

if org_width > org_height
  height = 450.0
  width = (height * org_width) / org_height
else
  width = 400.0
  height = (width * org_height) / org_width
end

`convert #{original_image} -resize #{width}x#{height} resized_original.jpg`

# Create an image of the same size as the background 
# with the resized original inset 
unless File.exist?('black.jpg')
  `convert -size 960x716 canvas:black black.jpg`
end

`composite -geometry +154+35 resized_original.jpg black.jpg composite_original.jpg`

# Create final image
parts = original_image.split('.')
final_image = parts[-2] + "_jongified." + parts[-1]
`composite composite_original.jpg kimjong.jpg mask.jpg #{final_image}`

# Clean up tmp images
File.delete('composite_original.jpg')
File.delete('resized_original.jpg')

puts final_image + " created"