Re: png-mng-misc Digest, Vol 60, Issue 30

OK, multiple eXIf chunks are forbidden.  By implication, it's also an error
to have an eXIf chunk and an ImageMagick Exif-in-zTXt chunk in the
same PNG file, but that's OK with me.  Same goes for zxIf if that is
present.  I don't know about ImageMagick's stream of tEXt chunks
with individual Exif attributes in them. I think that's OK as long as
those are write-only.  I'm not aware of any application presently
reading them back in and using them, except maybe for the
Orientation tag, which unfortunately doesn't have a PNG analog.

Glenn

On Mon, Feb 27, 2017 at 5:13 PM, Chris Lilley <[email protected]> wrote:
>
>
> On 2017-02-27 16:31, Phil Harvey wrote:
>>> From: Glenn Randers-Pehrson <[email protected]>
>>> No one has had anything to say about this draft.  Is it time to
>>> restart a CFD?
>> I would much prefer allowing only one eXIf chunk.  I don't see any cases where multiple chunks would be very useful, and they would cause me headaches when implementing a metadata writer -- I would need to add special logic to avoid duplicating information when writing to a file containing multiple eXIf chunks.
> I agree. unless there is
> a) a clear body of existing images with multiple exifs, and
> b) a clear description of how to interpret and modify them
> then it seems like extra complexity that hurts interop and gives no benefit.
>
> --
> Chris Lilley
> @svgeesus
> Technical Director @ W3C
> W3C Strategy Team, Core Web Design
> W3C Architecture & Technology Team, Core Web & Media
>
>
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