Re: CALL for DISCUSSION: eXIf 20170115

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.

I've seen Exif data in PSD, WebP, and BPG files, and they don't have this.
I'm aware of no formats, other than JPEG, that do.

(Update: I just discovered that libbpg keeps the second \0 from the ID
string when converting JPEG to BPG, but I'm pretty sure that's a bug in
libbpg.)

For reference, I believe this syntax comes from the JPEG-specific ITU-T
Rec. T.86 <http://www.itu.int/rec/T-REC-T.86/en>, "APPn marker syntax" (see
Figure 4-1).


On Sun, Jan 15, 2017 at 8:39 AM, Glenn Randers-Pehrson <[email protected]>
wrote:

>       CALL for DISCUSSION
>       eXIf 20170115
>       ftp://ftp.simplesystems.org/pub/png-group/documents/png-
> proposed-eXIf-chunk-2017-0115.html
>       Glenn Randers-Pehrson <glennrp at gmail.com>
>
>       This is a call for discussion on the PNG proposal
>
>            eXIf 20170115
>
>       A vote on this proposal will occur after at least
>       14 days have elapsed from the date/time of this
>       message, and at least 14 days from the last substantive
>       change to the proposal.  Voting will occur on the PNG
>       mailing list png-mng-misc-TtF/[email protected], following the
>       procedure specified in the document
>       ftp://ftp.simplesystems.org/pub/png-group/documents/png-
> registration-20170114.txt
>
>       Glenn
>
>
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-- 
Jason Summers

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