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	Thu, 22 Dec 2005 14:09:53 EST
Date: Thu, 22 Dec 2005 14:09:53 -0500 (EST)
From: David Scriven <davidwriter@yahoo.com>
To: tiff@lists.maptools.org
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Subject: [Tiff] Custom Tags, Private Ifds and other questions
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Status:   

We are intending to release a program under GPL that
will use TIFF files. The program requires that 13 or
more custom tags be set.

Looking at the TIFF 6.0 manual it indicates that
if you have 10 or more private tags you should
create a private Ifd, but looking through the
archives, I sense that there are some who dislike
the whole idea of a private Ifd. I would like
some guidance on the following questions:

1) Should one use a private Ifd?
2) If the answer is 'yes' how does one create a private Ifd.
Andrey mentions some tricks with libtiff - is there a code
snippet that someone could share?
3) I've been using a modification of Andrey's pgm (2003.11.17 
- "Fetching custom tags") to set and fetch the custom tags (Thank 
you, Andrey) - how would one modify this for the private Ifd tag?
4) Since these files will definitely be out in the wild, what
should be registered, and with whom?

I'm using version 3.6.1 under Fedora Core 3

David Scriven



	

	
		
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