Message-Id: <200007171925.MAA24236@dns.ccit.arizona.edu> Date: Mon, 17 Jul 2000 13:21:45 -0600 From: Tim Au Yeung <mailto:ytau@UCALGARY.CA> Subject: Re: xml in tiff headers To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
<pre>
You might want to take a look at the International Press Telecommunications
Council's Information Interchange Model (www.iptc.org). Part of their model
has been implemented in Photoshop and anyone with Photoshop using a TIFF or
JPEG can read metadata embedded in the file. Someone could put the XML doc
into the caption field that could be universally read. In addition, some
thumbnail/indexing apps can read the info as well (on the Mac side, I
believe Portfolio and Cummulus). The challenge may be embedding the info
into JPEG if it is particularly large. I seem to recall there being a block
size attached to JPEG comments that made embedding ICC profiles more complex
(although I'm not certain how large it was). In theory, you could develop a
relatively simple app that only looks at the first few blocks of an image to
cull the metadata without neccesarily opening the entire file (reading in
image dimensions works on this principle).
Tim
----- Original Message -----
From: "Eric Lease Morgan" <mailto:eric_morgan@NCSU.EDU>
To: <mailto:IMAGELIB@LISTSERV.ARIZONA.EDU>
Sent: Monday, July 17, 2000 11:32 AM
Subject: Re: xml in tiff headers
>
>
>
> Bob Savage (mailto:bsavage@STANFORD.EDU) wrote:
>
> > Another approach would be a standard XML TIFF-Wrapper which would
include
> > something like an "IMAGE" tag. Advantage: does not rely on software that
can
> > extract the header information before getting to the XML-encoded
metadata.
> > Disadvantage: not quite as simple to distribute (two files instead of
one).
>
> Bob, your analysis is right on target; in order for my idea to work I
would
> have to make available a "TIFF Helper", a program or library that could
read
> and write the XML into and out of the header. But, by putting the XML in
the
> header people will still be able see the image with the many TIFF readers
> available.
>
> --
> Eric Lease Morgan
>
</pre>
This archive was generated by hypermail 2b29 : Mon Jul 17 2000 - 14:27:11 CDT