Re: CFD: eXIf 2017-05-31

Glenn Randers-Pehrson <[email protected]> Fri, 9 Jun 2017 04:45:43 -0400
Newsgroups gmane.comp.graphics.png.general
Message-ID <CA+PdXcsT-6ucsFXAcgcUvrQYFKAV_TjQNR5uq6iDM_RALrCGGg@mail.gmail.com>
On Fri, Jun 9, 2017 at 4:29 AM, Pavel Zlatovratskii <[email protected]> wrote:

> 4.2) Historical EXIF data take priority over actual PNG chunk. Why this
> should be allowed? Do you really want to allow this?
> What I miss?

Consider a PNG file that contains an eXIf chunk with a historical Orientation
and a private "orNT" chunk containing an up-to-date image orientation.

An application that understands both will choose the value from the
orNT chunk, but "it is beyond the scope of this specification" to
mandate that.

Glenn

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