Tweak-ers only, all others: skip this message, please.

Slightly optimized version (same results) of the previous '/etc/magic'
for PNG:

        0       string          \x89PNG\x0d\x0a\x1a\x0a         PNG image data,
        !:mime  image/png
        >25     byte            0               grayscale,
        >25     byte            2               color RGB,
        >25     byte            3               colormap,
        >25     byte            4               gray+alpha,
        >25     byte            6               color RGBA,
        >28     byte            0               non-interlaced
        >28     byte            1               interlaced
        >16     belong          x               \b, %ld x
        >20     belong          x               %ld x
        >25     byte            0
        >>24    byte            x               %d
        >25     byte            2
        >>24    byte            8               24
        >>24    byte            16              48
        >25     byte            3
        >>24    byte            x               %d
        >25     byte            4
        >>24    byte            8               16
        >>24    byte            16              32
        >25     byte            6
        >>24    byte            8               32
        >>24    byte            16              64

HTH...



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