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pngcrush is an excellent batch-mode compression utility for PNG images. Depending on the application that created the original PNGs, it can improve the file size anywhere from a few percent to 40% or more (completely losslessly). The utility also allows specified PNG chunks (e.g. text comments) to be inserted or deleted, and it can fix incorrect gamma info written by Photoshop 5.0 as well as the erroneous iCCP chunk written by Photoshop 5.5.


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2012-07-28 06:38

标签: minor performance
This release eliminates many redundant file operations, resulting in a few percent speed increase.

2011-12-08 14:22

标签: Minor feature enhancements
This release adds the "-ow" option to overwrite the input file with the compressed file. If an output filename is given on the command line, it will be used as a temporary file and removed after compression. If not, "pngout.png" is used as a temporary file.

2011-10-15 10:46

1.7.18 版本无法读取隔行扫描的 Png。在此版本中解决此问题。
标签: bugfix
Version 1.7.18 failed to read interlaced PNGs. This problem is fixed in this release.

2011-10-15 00:35

取消了 libpng png_struct 成员已弃用的使用和非导出 libpng 函数的使用。Pngcrush 现在可以用 libpng-1.5.x 系统构建。
标签: Stable
Deprecated use of libpng png_struct members and use of non-exported libpng functions have been eliminated. Pngcrush can now be built with system libpng-1.5.x.

2009-09-11 03:58

此版本是建立与的libpng 1.2.40。还有的“详细”设置时的一些印刷,使“- s”选项更沉默额外检查。
标签: minor code cleanup
This version is built with libpng 1.2.40. There are some additional checks for the "verbose" setting when printing to make the "-s" option more silent.

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