arcmathThe #EXR high dynamic range motion picture file format now supports lossless #HTJ2K compression.
https://openexr.com/en/latest/news.html#september-5-2025-openexr-3-4-0-released
https://aras-p.info/blog/2025/07/08/Lossless-Float-Image-Compression/
Norman Barker#HTJ2K - does it need SIMD or does it need Rust? As one of the key features of J2K is great quality progression I am holding my judgement for now.
Johan van der KnijffThe first stable release of #Jpylyzer 2.2 is out now!
Main new feature is the support for High Throughput #JPEG2000 (#HTJ2K), and its JPH file format.
Also lots of other fixes and improvements, as well as some API and output enhancements:
https://jpylyzer.openpreservation.org/2024/01/23/jpylyzer-2-2-release
Just a reminder for who missed this earlier: a few weeks ago we published a release candidate for #jpylyzer 2.2, which is available for testing.
This release adds support of High Throughput #JPEG2000 #HTJ2K and its associated file formats, various codestream validation/parsing improvements, some output enhancements (including reporting of warnings), and an improved Python API.
Details here:
https://jpylyzer.openpreservation.org/2023/11/07/jpylyzer-2-2-release-candidate
Please let us know any issues, so we can fix them for the stable release!
The release candidate for #Jpylyzer 2.2 is out now! This is a truly action-packed release. Among other things, it adds support for High Throughput #JPEG2000 #HTJ2K. More info here:
https://jpylyzer.openpreservation.org/2023/11/07/jpylyzer-2-2-release-candidate
High Throughput #JPEG2000 #HTJ2K files are still rare in the wild, but I added a few to the Jpylyzer test files repo:
https://github.com/openpreserve/jpylyzer-test-files
Additional test files are welcome!
For the adventurous #Jpylyzer users out there, I published a (strictly unofficial!) beta of version 2.2.0, which includes support for High Throughput #JPEG2000 #HTJ2K.
Install using:
pip install --pre jpylyzer
To validate a JPH file:
jpylyzer --format jph oj-ht-byte.jph > out-jph.xml
To validate a HTJ2K codestream:
jpylyzer --format jhc oj-ht-byte_causal.jhc > out-jhc.xml
Draft docs are here:
An "official" release candidate will follow later.
Spent some time looking into software support for High Throughput #JPEG2000 #HTJ2K.
The only open source software I could find that can write the JPH format is OpenHTJ2K:
https://github.com/osamu620/OpenHTJ2K
And below some observations on a few other encoders I looked into:
https://github.com/openpreserve/jpylyzer/issues/197#issue-1873560610
(Not so) random quote from the High Throughput #JPEG2000 (#HTJ2K) white paper:
"As open source software, of course, the implementation has not been optimized nearly to the same extent as full commercial offerings such as that of Kakadu."
đ€·ââïž (noteworthy to mention here that the white paper's lead author is also the developer of Kakadu)
Link to full document: