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By crunching I meant crunching (who would have thought), not jpg lossy. I was talking about tools like:
pngcrush [Glenn Randers-Pehrson] (Unix, DOS, Win32, RISC OS, BeOS/x86, etc.) - all versions; read/write; freeware (BSD) with source, as of version 1.2.0. (This is a command-line utility to compress PNG images better--i.e., it converts PNGs into smaller PNGs, completely losslessly, by optimizing the filtering and compression strategies. It can also remove specified chunks and fix PNG images affected by the Photoshop 5.0 gamma bug or the Photoshop 5.5 iCCP bug. It's especially handy in conjunction with apps like PS that are a bit weak on compression. See also OptiPNG, PNGGauntlet, PNGOUT, pngrewrite, and pngwolf.)
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