pngcrush - PNG optimizer utility in openSUSEFeb 19, 2009, 06:02 (0 Talkback[s])
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"It reduces the size of the PNG IDAT datastream by trying various compression levels of 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 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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