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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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2013-02-16 08:55

此版本可实现"-减少"选项正确。这检查输入的文件,看看颜色类型、 位深度和调色板长度可以减少而不会丢失,如果有一个不透明的 alpha 通道,可以移除。
标签: Major feature enhancements

This version implements the "-reduce" option properly.

This examines the input file to see if the color type,
bit depth,
and palette length can be reduced without loss,
and if there is an opaque alpha channel which can be removed.

2012-10-25 09:36

此版本修复版 1.7.39 造成未能写入输出文件中引入的一个错误。
标签: bugfix
This release fixes a bug introduced in version 1.7.39 which caused failure to write an output

2012-09-02 14:49

索引的 PNG 文件的处理中的一个 bug 被固定了。
标签: bugfix
A bug in the handling of indexed PNG files was fixed.

2012-09-02 14:49

Pngcrush.c 导致它无法与一些索引的 PNG 文件中的更改已还原。
标签: bugfix
Changes in pngcrush.c that caused it to fail with some indexed PNG files were reverted.

2012-08-01 05:49

版本 1.7.34 介绍了在其中一个文件是打开每个审判压缩但从来没有写或关闭的 bug。在以后的试验系统依赖数字,pngcrush 不能打开一个文件以进行下一轮试验和退出。此版本修复了这个 bug。
标签: minor bugfix
Version 1.7.34 introduced a bug in which a file was opened for each trial compression but never written or closed. After a system-dependent number of trials, pngcrush was unable to open a file for the next trial and exited. This release fixes that bug.

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