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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.
Change log: Version 1.6.17 (built with libpng-1.2.36and zlib-18.104.22.168) Defined TOO_FAR == 32767 in deflate.c (again). The definition has continually been inadvertently omitted during zlib updates since pngcrush version 1.6.4. Revised handling of xcode files so at least we can get printout of IHDR values with "pngcrush -fix -n -v xcode.png" Version 1.6.16 (built with libpng-1.2.3 more»