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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 1.6.14 (built with libpng-1.2.35 and zlib-126.96.36.199) Version 1.6.12 (built with libpng-1.2.34 and zlib-188.8.131.52) Version 1.6.11 (built with libpng-1.2.33 and zlib-184.108.40.206) Eliminated a memory leak in libpng with writing bad tEXt chunks. Version 1.6.10 (built with libpng-1.2.31 and zlib-220.127.116.11) Add sTER chunk support. Version 1.6.9 (built with libpng-1.2.31 and zlib-1.2.3 more»