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Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels an PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including gAMA, tRNS, iCCP, and textual chunks.
<html><head><title>pngcrush changelog</title></head><body> <pre> Change log: Version 1.7.0 (built with libpng-1.2.38 and zlib-220.127.116.11) Save (but do not recompress) APNG chunks if the output file has the ".apng" extension and the color_type and bit_depth are not changed. Version 1.6.20 (built with libpng-1.2.38 and zlib-18.104.22.168) Changed local variable "write" to "wwrite" in inffast.c (z more»