pngcrush 1.7.73 发布，此版本更新内容如下：
Fixes a bug with reducing 16-bit images to 8-bit using the "-reduce" option
Restores calls to png_set_crc_action(), which had been removed from version 1.7.72 for some testing and inadvertently not restored
Adds code to fix/salvage PNG files with a "bad adaptive filter value" error. Avoids calculating CRC during compression trials except for the last trial, when the output is actually written
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。
项目主页：http://sourceforge.net/projects/pmt/
下载地址：http://sourceforge.net/projects/pmt/files/
来自:oschina开源中国社区
