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February 2007
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2007.02.04 20:58 "Re: tag for tags", by Chris Cox
Huh?
The IPTC tags and XMP tags are separate from the Photoshop info.
Both are stored exactly as their public specifications say they should be.
The Photoshop info can hold a second copy of the IPTC data, depending on how
it was edited previously (to resolve conflicts).
Photoshop will also attempt to read and preserve EXIF metadata tags ("maker
note" tags cannot be preserved, and many EXIF tags have to be updated).
Yes, there are multiple metadata standards, but I don't see why you think
it's hidden.
Yes, the multiple standards can make things confusing, especially when there
are conflicts between different data blocks.
But if you're writing the file, you can pick one (prefereably something
simple, flexible and extensible like XMP) and stick with it.
Chris
PS. (yes, I'm actually advocating an XML standard - you can stop laughing
now)
-----Original Message-----
From: tiff-bounces@lists.maptools.org on behalf of Toby Thain
Sent: Sun 2/4/2007 12:51 PM
To: Alessandro Zummo
Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] tag for tags
On 4-Feb-07, at 6:15 PM, Alessandro Zummo wrote:
> On Sun, 4 Feb 2007 18:07:20 -0200
> Toby Thain <toby@smartgames.ca> wrote:
>
>>> is there any standard tag to hold tags (keywords) that
>>> have been used to describe an image?
>>
>>
>> Interoperability with PS' File Info interface might be the de facto
>> standard. Photoshop stores them in a puzzle wrapped in an enigma and
>> an IPTC stuffed in an IRB and legitimised by an Adobe specific tag so
>> on... you can find more details in Adobe's docs.
>
> sounds nice :)
>
> maybe we can define and register a tag ?
Well it won't be interoperable with anything else. There are 1,001
metadata editors already out there, some more research might be
worthwhile.
Chris Cox might chime in with Best-Practices-du-jour for Hiding
Keywords in TIFF. :)
--T