Re: EXIF support in PNG

That's interesting but doesn't sound like KISS.  I think it's sufficient
to just mention in the chunk spec that some items might no longer apply
tot he current image if the image has been reformatted.

Glenn

On Mon, Jan 2, 2017 at 3:08 AM, Adam M. Costello <
png.amc+0-NbS3tD7h7f/[email protected]> wrote:

> John Bowler <[email protected]> wrote:
>
> > The chunk needs to be unsafe-to-copy; it contains color space information
> > so it behaves in a way similar to iCCP.
>
> Just an idea:  Define eXIF and eXIf to have the exact same syntax, but
> slightly different meaning:
>
> eXIf (safe-to-copy) contains metadata for some past version of the
> image.  Some or all of the metadata may not apply to the current image,
> but may be of historical interest.
>
> eXIF (unsafe-to-copy) contains metadata consistent with the current
> image.  An editor that alters a critical chunk must update eXIF to
> maintain that consistency, or rename it to eXIf, or drop it (the default
> behavior if it is unknown).
>
> Either eXIf or eXIF may appear (at most once), but not both.
>
> AMC
>
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