ruby 로 thumbnail 만들기

1. ImageMagick 설치

http://www.imagemagick.org/script/install-source.php

2. RMagick 설치

http://rmagick.rubyforge.org/install2-linux.html

3. 테스트

$ irb -rubygems
irb(main):001:0> require 'RMagick'
=> true
irb(main):002:0> include Magick
=> Object
irb(main):003:0> im = Image.read("10.jpg").first
=> 10.jpg JPEG 1280x960 1280x960+0+0 DirectClass 8-bit 190kb
irb(main):005:0> t = im.thumbnail 150, (im.rows*150/im.columns)
=> 10.jpg JPEG 1280x960=>150x112 150x112+0+0 DirectClass 8-bit 190kb
irb(main):006:0> t.write "10c.jpg"
=> 10.jpg=>10c.jpg JPEG 1280x960=>150x112 150x112+0+0 DirectClass 8-bit 5kb