支持 apng 的 libpng 库，2011.5月的 1.4.7 版本-libpng v1.4.7 with apng patch.

Imaging is native Object Pascal image loading, saving and manipulation library. It is available for several platforms and does not require any third party dynamic libraries or other compiled binaries. Main development language is Object Pascal

将apng格式的文件转成gif格式的文件-Apng file will be transferred into a gif file