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Project Description

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

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.
Tags: Major feature enhancements

2012-10-25 09:36

This release fixes a bug introduced in version 1.7.39 which caused failure to write an output
Tags: bugfix

2012-09-02 14:49

A bug in the handling of indexed PNG files was fixed.
Tags: bugfix

2012-09-02 14:49

Changes in pngcrush.c that caused it to fail with some indexed PNG files were reverted.
Tags: bugfix

2012-08-01 05:49

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.
Tags: minor bugfix

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