in reply to Re^2: Matching Images
in thread Matching Images

PNG is lossless. It's reason for being was to replace GIF, a lossless format.

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Re^4: Matching Images
by LanX (Saint) on Nov 22, 2010 at 16:27 UTC
    A right! Thx, I had wavelet stuff in mind like DjVu...

    So if the PNG is created from a JPG original it can work, the other direction or just another source would IMHO likely fail.

    (Though I have no stats about compression defaults for JPEGs)

    Cheers Rolf

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