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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 Back to release list

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.

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