Re: CALL for DISCUSSION: eXIf 20170115

Glenn Randers-Pehrson <[email protected]>
Newsgroups gmane.comp.graphics.png.general
Message-ID <CA+PdXcuGt-1V2hr4G4PSy-ysf+gyJ_K8hSAvt9msrZXxS1cwFA@mail.gmail.com>
I updated the proposal to version 2017-0119, replacing the
two paragraphs defining the contents of the data segment
with this:

The data segment of the eXIf chunk contains an Exif profile in the
format specified in "4.7.2 Interoperability Structure of APP1 in
Compressed Data" of [CIPA DC-008-2016] except that the JPEG APP1
marker, length, and the "Exif ID code" described in 4.7.2(C), i.e.,
"Exif", NULL, padding byte, are not included.  It begins
with either "II" or "MM", depending upon the byte order used.

Glenn

On Thu, Jan 19, 2017 at 4:03 PM, John Bowler <
[email protected]> wrote:

> On Thu, Jan 19, 2017 at 10:58 AM, Jason Summers <[email protected]> wrote:
> > Sorry if I missed something, but as far as I can tell, the plan is still
> to
> > put a JPEG app ID string (or "Exif ID code" as they call it in ExifLand)
> > ("Exif\0\0") in PNG files.
> >
> > I think that's a bad idea. The JPEG app ID string is a JPEG-specific
> thing
> > that doesn't belong in other formats.
>
> It does make more sense to me to skip it but there may be a good reason
> for it.
>
>

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