Re: EXIF support in PNG [was: Modern compressor]

I can't remember what the quorum is, but there should be enough people
still reading the list for a vote.

I expanded what I said very slightly on the original thread where Glenn
explained that {Image,Graphics}Magick are currently doing broadly the same
thing use a zTXt tag and hex encoding.  The fact that this horrible
solution exists and that Cosmin had previously implemented the 'raw'
proposal is pretty good justification for standardization.

I don't know where the authoritative specification of the data is;
apparently JEITA owns it but ideally there would be a reference to an
international standard.

One of the reasons PNG is static is that there are no obvious widely
adopted de facto extensions.  I think this is an exception; several
extensions to do this do exist but they are each different and that is the
criterion standard bodies state for adopting an extension or modification
of a standard.

John Bowler
​

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