File: preview.rb

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ruby-rmagick 6.0.1-3
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require 'rmagick'

img = Magick::Image.read('images/Flower_Hat.jpg').first
Magick::PreviewType.values.each do |type|
  puts "** Generate #{type}"
  preview = img.preview(type)
  preview.minify.write("preview_#{type}.jpg")
end