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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 1.7.20 (built with libpng-1.5.5 and zlib-1.2.5) Removed the call to png_read_transform_info() when the system libpng is being used, so it can be built with a system libpng. Version 1.7.19 (built with libpng-1.5.5 and zlib-1.2.5) pngcrush-1.7.18 failed to read interlaced PNGs. Reverted the change more»