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Date: Fri, 1 Oct 2004 17:52:35 -0500 (CDT)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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To: Chris Losinger <losinger@earthlink.net>
Subject: Re: [Tiff] Re: reading private subdirs
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On Fri, 1 Oct 2004, Chris Losinger wrote:

>
> 	It looks like this topic fell by the way without much of a 
> resolution. Unfortunately, it's rather important to me; so I'm going to try 
> to revive it :)
>
> 	Are there any plans to do either of the options listed below (or to 
> do something else that would allow reading and enumeration of non-image 
> private subdirs ) ?

I saw myself mentioned below in the forwarded email.  I am no EXIF or 
IFD expert (yet) but am interested in supporting EXIF in libtiff so 
that it can be used by GraphicsMagick (or any other software).  If 
there is code you can donate, or experience that you can offer, I am 
certainly interested in hearing about it.  My obligations keep me 
stretched pretty thin so it is not yet clear when I can do the work.

Bob

> Thu Sep 16 11:55:47 EDT 2004
> Frank Warmerdam Wrote:
>> In short, I think some non-trivial work would be required to make the normal
>> TIFF directory reading code work smoothly with non-image IFDs such as those
>> used for EXIF.
>>
>> I see a couple approaches to this:
>>
>>  1) Introduce a version of the tiff_pdsdirread.c code into the core of
>>     libtiff specifically for reading non-image IFDs.
>>
>>  2) Try and make the normal directory reading somehow work with non-image
>>     IFDs.
>>
>> I am inclined to think that (1) would be easier to incorporate without
>> potentially causing alot of extra problems.  However, I am unlikely to do
>> the implementation myself so we will have to hear from Bob and Andrey.  As
>> Bob mentioned, he is hoping to develop and incorporate EXIF support into
>> the libtiff core so it might be best to work with him to resolve this issue.
>
> __________________________
> Chris Losinger
> Smaller Animals Software, Inc. 
> http://www.smalleranimals.com
>
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======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen
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