Re: DRAFT: eXIf 2017-03-02

the purpose of a PNG EXIF chunk is simply to store the EXIF data (from a 
JPEG image)

if you take elements out of the JPEG (or whatever) EXIF data and store 
them in a PNG chunk then that's not an EXIF chunk anymore

call it a GPS chunk, a THUMBNAIL chunk, etc. but not EXIF

and you don't need a new GPS chunk, because you can just define a GPS 
keyword in a TEXT/ITXT chunk

I like the current proposal on simplesystems

it is SIMPLE :-)

Willem


On 2017-03-03 10:14, Glenn Randers-Pehrson wrote:
> On Fri, Mar 3, 2017 at 10:50 AM, John Bowler
> <[email protected]> wrote:
>> On Fri, Mar 3, 2017 at 4:28 AM, Glenn Randers-Pehrson <[email protected]> wrote:
>
>> I also don't see why I shouldn't just put the EXIF tags into IFD[0];
>> the level of indirection is of no benefit in a single-image format.
>
> It would be a redesign of the eXIf chunk, but we could do that.
> Just eliminate the TIFF header and IFD structure, and only put
> a consecutive stream of EXIF/GPS/thumbnail tags in eXIf.
>
> That's more or less what I tried to do 10-12 years ago, but
> the project died due to lack of interest.
>
> That means conversion back to JPEG or TIFF would involve
> rebuilding the IFD structure, but that's pretty simple.
>
> Glenn
>
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-- 
Willem van Schaik
[email protected]

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