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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