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2018.11.04 20:20 "Libtiff will be released soon", by Bob Friesenhahn
2018.11.04 20:49 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.04 23:35 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.05 14:51 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.05 15:28 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.05 15:38 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.07 19:19 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.09 16:44 "Re: Libtiff will be released soon", by Edward Lam
2018.11.09 17:23 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.09 18:49 "Re: Libtiff will be released soon", by Edward Lam
2018.11.09 19:04 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.09 19:14 "Re: Libtiff will be released soon", by Edward Lam
2018.11.09 20:53 "Re: Libtiff will be released soon", by Roger Leigh
2018.11.09 22:11 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.10 15:00 "Re: Libtiff will be released soon", by Bob Friesenhahn
2018.11.10 16:04 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.10 18:14 "Re: Libtiff will be released soon", by Larry Gritz
2018.11.10 19:41 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.10 21:30 "Re: Libtiff will be released soon", by Larry Gritz
2018.11.28 12:43 "Re: Libtiff will be released soon", by Kemp Watson
2018.11.05 14:06 "Re: Libtiff will be released soon", by Edward Lam
2018.11.05 14:34 "Re: Libtiff will be released soon", by Kemp Watson

2018.11.05 14:51 "Re: Libtiff will be released soon", by Kemp Watson

Unfortunately, TIFF is generally not at the top of my "hot mess" list...

Re "Private TIFF tags have no business in libtiff header files since libtiff
does not use them.  Libtiff can offer to store such information in a file in
its source repository, suitably vetted to any trade secret issues.":  if
this is the case, may I submit a change request to have lines 376 through
619 of tiff.h removed, including your recent additions of ZSTD and WebP.

Thanks,

Kemp Watson


´╗┐On 2018-11-04, 6:35 PM, "Bob Friesenhahn" <bfriesen@simple.dallas.tx.us>
wrote:

    On Sun, 4 Nov 2018, Kemp Watson wrote:
    
    > I see in tiff.h, lines 193,194 that ZSTD and WEBP compressions are
    > assigned tags 34926 and 34927 respectively. These tags were already
    > issued for other purposes as of October 2015, when I registered tags
    > 34933 through 34936, so they will definitely be stomping over someone.
    > Where is Adobe's response to this situation?
    >
    > Also, I'd registered private TIFF tags 51159 and 51160 - should they
    > go into the header file, or be declared by users who need them
    > separately?
    
    It is unfortunate that we are only hearing about this collision now, 
    although you were aware that these features were being developed, and 
    you were aware of the definite possibilty of a collision given the 
    concerns you already expressed several times about the lack of a 
    working registry.
    
    I invite you, and anyone else to share TIFF tag numbers which were 
    allocated by Adobe and which are now in danger of colliding with 
    independent tag allocations.  It is only necessary to know the numbers 
    to avoid.  It is highly irresponsible for Adobe to not publish a list 
    of the numbers which have already been allocated.
    
    Re-use of tags is only a problem if a file using the conflicting tag 
    is opened by software which implements a feature based on that tag id.
    
    Files written by libtiff are likely to become popular so it behooves 
    implementors of proprietary TIFF software to try to avoid collisions.
    
    This is the 'tiff' mailing list and not at all limited to discussions 
    of libtiff development.
    
    Private TIFF tags have no business in libtiff header files since 
    libtiff does not use them.  Libtiff can offer to store such 
    information in a file in its source repository, suitably vetted to 
    avoid any trade secret issues.
    
    Bob
    -- 
    Bob Friesenhahn
    bfriesen@simple.dallas.tx.us,
    http://www.simplesystems.org/users/bfriesen/
    GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
    
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