Hi,
GDAL has a TIFF JPEG-XL codec at
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%
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