PNG图像压缩工具-pngcrush
2013-03-02 19:10:41 
阿炯
pngcrush 是一个用来批量压缩 PNG 格式图片的工具，使用pngcrush大概可以减少png图像大小 40% 左右。Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline.
Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels and PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including gAMA, tRNS, iCCP, and textual chunks.
Pngcrush is open source and may be used, modified, and redistributed by anyone without paying a fee. The license, embedded in the file pngcrush.c, is equivalent but not identical to the libpng license found in the libpng file png.h.
最新版本：1.7
正确实现了 -reduce 参数，该参数检查输入文件的色彩类型、色深、调色板的数据，可无损进行压缩。
项目主页：http://pmt.sourceforge.net/pngcrush/