pngcrush: pngcrush (optimizer for PNG) pngcrush: pngcrush: Its main purpose is to reduce the size of the PNG IDAT datastream pngcrush: by trying various compression levels and PNG filter methods. pngcrush: It also can be used to remove unwanted ancillary chunks, or to add pngcrush: certain chunks including gAMA, tRNS, iCCP, and textual chunks. pngcrush: pngcrush: pngcrush: Homepage: http://pmt.sourceforge.net/pngcrush/ pngcrush: pngcrush: