Re: DRAFT: eXIf 2017-03-02

Glenn Randers-Pehrson <[email protected]> Fri, 3 Mar 2017 06:39:16 -0500
Newsgroups gmane.comp.graphics.png.general
Message-ID <CA+PdXcvhY7JnvCBh4ANi8Fgd3=HVeBaqn2eDuVxGkW6C6kx0Gw@mail.gmail.com>
On Fri, Mar 3, 2017 at 4:44 AM, Pavel Zlatovratskii <[email protected]> wrote:
> I think "and/or" should be read as "or IFD[0] or IFD[1] or both".

Yes, that is what it means.

>
> IFD[0] could be used if eXIf contains only metadata; IFD[1] could be
> used for preview without metadata; both - for preview and metadata.

Yes, that seems to be what the Exif specification allows.

>
> Another solution is design preview chunk and forbid IFD[1] in eXIf

Sure, but why?  We're simply trying to preserve Exif data, not invent
more.

Glenn

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