Ruby图像处理组件rmagick在windows下的安装和使用

windows下安装rmagick比较麻烦

安装 DevKit，这个DevKit就是Ruby在windows下调用的编译器 : https://github.com/oneclick/rubyinstaller/wiki/Development-Kit

安装 ImageMagick，勾选安装头文件，目录不要带空格。 http://www.imagemagick.org/script/binary-releases.php/#windows

设置到环境变量

set DFImageMagick ImageMagick的安装目录
set PATH=%DFImageMagick%;%PATH% 
set CPATH=%DFImageMagick%\include;%CPATH%
set LIBRARY_PATH=%DFImageMagick%\lib;%LIBRARY_PATH%

校验一下安装的结果：

A. convert -version 显示ImageMagick的版本

B. gem list –local 输出中应该包含 rmagick 2.13.1

进入irb 测试 require ‘rmagick’ 应该输出 ‘true’

使用RMagick，重要会用到两个对象：Image和Draw。

#encoding : UTF-8

require 'rmagick'

img = Magick::Image.read('D:\\demo4.jpg').first
thumb = img.resize_to_fit(1280)
thumb.write('D:\\demo4.thumb.jpg') {self.quality = 50}

puts 'down'

#resize ⇒ Object
Scale an image to the desired dimensions using the specified filter and blur factor.

#resize_to_fill(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object (also: #crop_resized)
Force an image to exact dimensions without changing the aspect ratio.

#resize_to_fit(cols, rows = nil) ⇒ Object
Convenience method to resize retaining the aspect ratio.

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