ImageMagick 一些简单用法

参考链接

• ImageMagick v6 Examples – Resize or Scaling (General Techniques)
• http://blog.csdn.net/newborn2012/article/details/24964577
• http://community.itbbs.cn/thread/20402/
• http://www.charry.org/docs/linux/ImageMagick/ImageMagick.html