Re: CALL for DISCUSSION: eXIf 20170115

My demos had the "ExifID" because that's what ImageMagick gave me when I
ran "convert file.jpg file.exif", and I thought that was what an "exif
profile" was.  As I understood Jason's comment and John's earlier remarks,
that was a mistake.

The 0119 version of the proposal is still a "proposal", subject to
discussion and amendment.

Meanwhile, I've got my copy of ImageMagick fully supporting the current
proposal, via a libpng user callback, only tested so far with libpng-1.2.54

Glenn

On Sat, Jan 21, 2017 at 1:11 AM, John Bowler <
[email protected]> wrote:

> On Fri, Jan 20, 2017 at 8:51 PM, Willem van Schaik <[email protected]>
> wrote:
> > why updating the chunk proposal before any serious discussion has
> > happened ??
>
> I raised the point before Glenn wrote the formal proposal, no one
> expressed an opinion (beyond my original one, which was pretty much a
> non-opinion).
>
> So an opinion was expressed and that has to tip the balance.  No one
> else said anything one way or another.
>
> On balance I prefer it without the JPEG ID which was there only to
> resolve the issue with JPEG APP markers being, of themselves,
> unidentifiable.  It all seems logical to me; the JPEG ID becomes the
> PNG chunk ID, the marker length becomes the PNG chunk length, the
> data, the real payload, is as in JPEG.
>
> Precisely what goes on in TIFF, the only other supported EXIF format,
> is irrelevant because TIFF is the native format of EXIF; JPEG is a
> non-native format and so is PNG.
>
> John Bowler
>
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