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Date: Wed, 24 Jul 2002 20:58:57 -0400
To: tiff@olympiakos.com
From: Bill Comstock <bill_comstock@pobox.com>
Subject: embedding metadata in TIFF and JPEG/JFIF images
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Re: embedding metadata in image files

I contribute TIFF images (and other formats) to an archive committed to 
managing, preserving, and migrating these images, as needed, long into the 
future.  The notion of embedding metatada into these files (more data, more 
precisely tagged, than the header allows) is extremely appealing.  I've 
been experimenting with embedding Exif metadata and XMP (Adobe's Extensible 
Metadata Platform).

Questions:

* Does embedding additional metadata in TIFF files, in either of these 
formats (XMP, Exif), make these files vulnerable to application 
failures?  We've been careful to produce TIFF images that are very 
generically encoded.  We want to maximize the archive's chances of 
frustration-free future format migrations.

* XMP claims to be based on the W3C's RDF (Resource Description Framework) 
specification.  The metadata syntax is XML.  It seems like a very 
attractive, open specification for embedding metadata.  Can anyone speak to 
the risks and advantages to embedding TIFFs with metadata in one format or 
the other?

I'm really interested in getting feedback from imaging application 
developers and  TIFF format gurus, especially those familiar with using 
Exif or XMP to load images with metadata.

Many thanks,

Bill Comstock 


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