Source of OpenEXR

- https://ja.wikipedia.org/wiki/OpenEXR

- OpenEXR使おうぜ
--  [http://blog.taikomatsu.com/2010/03/21/openexr%E4%BD%BF%E3%81%8A%E3%81%86%E3%81%9C/ http://blog.taikomatsu.com/2010/03/21/openexr使おうぜ/]