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November 2018

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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

2018.11.09 20:53 "Re: Libtiff will be released soon", by Roger Leigh

On 09/11/2018 18:49, Edward Lam wrote:
>> Regardless, we need to get another libtiff release out.
> 
> I'm not disagreeing. But we should at least do use something else as Kemp noted?
> 
> On 11/4/2018 3:49 PM, 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?
> 
> So maybe we should at least try something like 34937 - 34938 ?

If Adobe aren't able to do anything, we could take a leaf out of the 
OpenZFS developers' book.  When new features are added to the ZFS 
filesystem, the pool version is incremented.  They needed to be able to 
update the ZFS pool version without the version numbers clashing with 
the versioning and features used in Solaris.  They bumped the version 
from 28 to 5000 to avoid the possibility of clashes.

We could potentially do the same.  Assuming the tags are allocated in a 
linear order, if we jumped all the way to e.g. 50000 we would avoid 
clashes with Adobe tag registration for some time to come.  Or if Adobe 
could grant us a chunk of e.g. 1000 tags, we could manage their usage 
and standardisation ourselves.

Given the danger of interoperability problems with nonstandard tags, it 
should I think be a prerequisite to have this sorted out before making a 
new release.  If people start to use e.g. zstd and then we have to 
change the tag numbers, that would be quite unfortunate.


Regards,
Roger