gistfile1.rb

# Mini Magick VS Image Science

require 'benchmark'
require 'rubygems'
require 'mini_magick'
require 'image_science'

@count = 0

def create_mini_magick_thumbnail
  img = MiniMagick::Image.from_file(ARGV[0])
   return if img[:width] < 64 or img[:height] < 64
   if img[:width] > img[:height]
     # Height given, width automatically selected to preserve aspect ratio
     img.resize('x64')
   else
     # Width given, height automatically selected to preserve aspect ratio
     img.resize('64')
   end
   # Format to JPEG before cropping. ImageMagick raises a strange exception
   # when cropping animated GIFs
		img.format('jpeg')
   # Calculate centred offset for best results and crop
   x_offset = img[:width] > 64 ? (img[:width] - 64) / 2 : 0
   y_offset = img[:height] > 64 ? (img[:height] - 64) / 2 : 0
   img.crop("64x64+#{x_offset}+#{y_offset}")
   img.write("dump/#{@count += 1}_image_magick.jpg")
end

def create_image_science_thumbnail
  ImageScience.with_image(ARGV[0]) do |img|
     img.cropped_thumbnail(64) do |thumb|
       thumb.save("dump/#{@count += 1}_image_science.jpg")
     end
  end
end

Benchmark.benchmark do |b|
  b.report { 50.times { create_mini_magick_thumbnail } }
  b.report { 50.times { create_image_science_thumbnail } }
end