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To: Chris Losinger <chrisdl@pagesz.net>
cc: tiff@olympiakos.com
Subject: Re: reading EXIF data from a TIFF 
In-reply-to: <4.2.0.58.20020306232531.02f108f8@pop3.norton.antivirus> 
References: <4.2.0.58.20020306232531.02f108f8@pop3.norton.antivirus>
Comments: In-reply-to Chris Losinger <chrisdl@pagesz.net>
	message dated "Wed, 06 Mar 2002 23:27:00 -0500"
Date: Thu, 07 Mar 2002 00:51:38 -0500
Message-ID: <8233.1015480298@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Chris Losinger <chrisdl@pagesz.net> writes:
> 	i've written a parser that works on the EXIF data in JPEG_APP1 markers 
> from JPG files, and i'm hoping i can use it to parse the data in TIFF 
> files. bt, i can't find out where or how to get the EXIF data block out of 
> a TIFF.

You're probably looking at it the wrong way 'round.  EXIF's JPEG marker
contains a mini-TIFF file, which I'd always supposed meant that they
thought the world revolves around TIFF ;-)  More than likely, the
equivalent info appears as TIFF tags interspersed with the regular TIFF
tags when you look at an EXIF-compliant TIFF.  In other words, point
your EXIF parser at the whole darn TIFF file...

			regards, tom lane
			organizer, Independent JPEG Group

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