AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2005.12.22 19:09 "[Tiff] Custom Tags, Private Ifds and other questions", by David Scriven
2005.12.22 19:39 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by Joris
2005.12.22 22:24 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by Frank Warmerdam
2005.12.22 23:02 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by David Scriven
2005.12.22 23:32 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by Joris
2005.12.22 23:25 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by Joris
2005.12.22 19:52 "Re: [Tiff] Custom Tags, Private Ifds and other questions", by Chris Cox

2005.12.22 19:09 "[Tiff] Custom Tags, Private Ifds and other questions", by David Scriven

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?
  5. I'm using version 3.6.1 under Fedora Core 3

David Scriven

__________________________________________________________
Find your next car at http://autos.yahoo.ca