php gif处理

http://www.jb51.net/article/51702.htm

https://github.com/Sybio/GifCreator

https://github.com/Sybio/GifFrameExtractor

https://github.com/Sybio/ImageWorkshop

http://phpimageworkshop.com/

http://blog.csdn.net/mingzznet/article/details/50545008  gif介绍

https://github.com/ErikvdVen/php-gif