Hi Leonard,
I may have seen this. But how would that affect JXL-in-TIFF ? In HEIC,
HEIC plays the same role as TIFF as a container, right? What kind of
alignment are you thinking too exactly? The embedding of the JPEG XL
codestream into each container is a container specific matter. In the
instance of TIFF, there isn't even a new TIFF tag needed (just pseudo
tags to configure the compressor)
Even
Le 29/11/2025 à 19:23, Leonard Rosenthol a écrit :
Even - are you aware of the work at ISO/IEC (JTC 1/SC 1 & 2) to bring
JPEG XL into HEIC files? It would be good to align those two
efforts, since in both cases they are using JXL code streams within a
larger container format.
Leonard
*From: *Tiff <[email protected]> on behalf of Even Rouault
via Tiff <[email protected]>
*Date: *Saturday, November 29, 2025 at 6:55 AM
*To: *Bob Friesenhahn <[email protected]>, Romeyke,
Andreas <[email protected]>, '[email protected]'
<[email protected]>
*Subject: *Re: [Tiff] Overview of supported/registered compression
mode? Anybody working on FFV1 or QOI support?
EXTERNAL: Use caution when clicking on links or opening attachments.
Hi,
GDAL has a TIFF JPEG-XL codec at
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FOSGeo%2Fgdal%2Fblob%2Fmaster%2Ffrmts%2Fgtiff%2Ftif_jxl.c&data=05%7C02%7Clrosenth%40adobe.com%7C55fa6e1ffaf2419bd71908de2f038193%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638999889276501186%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=RhvMp0ZYfTup1qTXiXxm6LMwxVonB1nhZils37Cl7ts%3D&reserved=0
<https://github.com/OSGeo/gdal/blob/master/frmts/gtiff/tif_jxl.c> relying
on libjxl. I'll likely submit it to libtiff upstream some day. I had
been waiting for libjxl to go to the 1.0 milestone for that for now.
Even
Le 28/11/2025 à 15:32, Bob Friesenhahn via Tiff a écrit :
> I have not heard of anyone working on QOI or FFV1 compression in
> libtiff. If the work is performed suitably well (according to project
> standards) and there is some assurance of continued support, the usage
> license matches libtiff's license, and there is some assurance of
> development support for some time after integration, the work is
> likely to be integrated.
>
> The performance of compression in libtiff is rather dependent on
> strip/tile sizes. Have you investigated modifying strip/tile sizes to
> see if more can be gained from existing codecs?
>
> Have you tried WebP compression in libtiff? There is lossless WebP
> support in libtiff! WebP compression should work rather well provided
> that the image is a natural scene. WebP does not support large
> images, but it should work well if a large image is diced up into tiles.
>
> Bob
>
> On 11/28/25 08:01, Romeyke, Andreas via Tiff wrote:
>>
>> Hi,
>>
>> For our long-term archive, we are considering switching from baseline
>> TIFF 6.0 to a successor format that can efficiently compress images
>> losslessly. To minimize conversion issues, one option would be to
>> simply change the codec within TIFF. We've seen that "tiffcp"
>> supports lzw, lzma, and zstd.
>>
>> Compared to the lossless encoding in Quite OK Image File Format
>> (qoi), PNG, and especially compared to FFV1 or JPEG XL, the
>> achievable compression rates are suboptimal[1].
>>
>> Therefore, our question is:
>>
>> Is there an overview of which codecs libtiff currently supports?
>>
>> And is anyone already working on integrating qio or FFV1?
>>
>> If not, would such extensions have a chance of being incorporated
>> into libtiff?
>>
>> With best regards
>>
>> Andreas
>>
>> [1] our testset (scans historic monographs) results in ff. lossless
>> compression ratios:
>>
>> tiff/lzw – 94%
>>
>> tiff/zstd – 67%
>>
>> qoi – 50%
>>
>> png – 53%
>>
>> ffv1 – 36%
>>
>> jpeg-xl – 33%
>>
>> --
>>
>> team member “long-term preservation“
>>
>> Saxon State- and University Library Dresden (SLUB)
>>
>> Department 2 (IT), Division 2.3 (infrastructure and digital long-term
>> preservation)
>>
>> Zellescher Weg 18 | 01069 Dresden
>>
>> phone: +49 351 4677 763
>>
>> E-Mail: [email protected]
>> <mailto:[email protected]
<mailto:[email protected]>>
>>
>>
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