[gdal-dev] Fwd: Re: [Tiff] Libtiff will be released soon

[Even Rouault]

Hi all,

Due to Adobe no longer assigning TIFF tags / tags value, and someone mentionning that
the previously values use for COMPRESSION_ZSTD and COMPRESSION_WEBP were already taken,
those have been just changed:

https://gitlab.com/libtiff/libtiff/commit/126a949736fe8d2684525706e9047b39e2a095a6

I'll resynchronize the internal GDAL copy with that, which means that if you have
existing TIFF file using ZStd / WebP compression, they will no longer be recognized.
I imagine we could come with a hack to still recognize the old values, but I don't
plan to go to that complication unless really needed.

Even

----------  Forwarded Message  ----------

Subject: Re: [Tiff] Libtiff will be released soon
Date: samedi 10 novembre 2018, 09:00:18 CET
From: Bob Friesenhahn <bfriesen at simple.dallas.tx.us>
To: Roger Leigh <rleigh at codelibre.net>
CC: tiff at lists.maptools.org

On Fri, 9 Nov 2018, Roger Leigh wrote:
>
> 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.

I just submitted a changeset such that COMPRESSION_ZSTD is changed to 
50000 and COMPRESSION_WEBP is changed to 50001.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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