Re: EXIF support in PNG

On Sat, Jan 14, 2017 at 2:04 PM, Willem van Schaik <[email protected]> wrote:
> Why I still don't like the compressed option, is that well behaving PNG
> decoding software are required to implement both modes. For example a
> simple "png2exif" tool now needs to include a zlib library.

Seconded, and not just that; the proposers are unable or unwilling to
provide a testable sample implementation, after saying it is "only
three lines of code."

Of course if there were two separate chunks, which was the last but
one counter-proposal, then decoders would be free not to decode the
compressed one; for example until I recently modified it "pngcheck -t"
did not decode the zTXt text, it just displayed the comment, yet it
did contain code (based on zlib) to decode the IDAT chunks!

I certainly can't see any merit to this new complexity; it just means
that now decoders have to have two code paths.

-- 
John Bowler <[email protected]>
+1 (541) 450-9885
PO BOX 3151
KERBY OR 97531-3151
USA

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