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Merged
ajelenak merged 5 commits into from
Aug 25, 2026
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Register plugin 32033 #282

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ac28ed3
Register plugin 32033
ajelenak Aug 7, 2026
5236fcd
Fix typos
ajelenak Aug 9, 2026
3842e02
Update docs/RegisteredFilterPlugins.md
ajelenak Aug 17, 2026
d39da4d
Update docs/RegisteredFilterPlugins.md
ajelenak Aug 17, 2026
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Update docs/RegisteredFilterPlugins.md
ajelenak Aug 25, 2026
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22 changes: 22 additions & 0 deletions docs/RegisteredFilterPlugins.md
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Expand Up @@ -63,6 +63,7 @@ Upon receiving a request with the above information, HDF Group will register the
|`32030` |<a href="#ffmpeg">FFMPEG</a> |A lossy compression filter based on ffmpeg video library|
|`32031` |<a href="#jpeg2000">JPEG2000</a> | A compression filter for lossy and lossless coding|
|`32032` |<a href="#bitround">BitRound</a> | The BitRound floating-point value quantization algorithm |
|`32033` |<a href="#htj2k">HTJ2K</a> | High-Throughput JPEG 2000 (HTJ2K) compression |

> [!NOTE]
> Please contact the maintainer of a filter plugin for help with the plugin or its filter in the HDF5 library.
Expand Down Expand Up @@ -914,6 +915,27 @@ https://github.com/hmaarrfk/hdf5_jpeg2000/
Mark Harfouche
mark dot harfouche at gmail dot com

#### Plugin ID `32033` <a name="htj2k"></a>

[High Throughput JPEG 2000 (HTJ2K)](https://jpeg.org/jpeg2000/htj2k.html) is an addition to the JPEG 2000 family of International Standards developed by JPEG Committee (ISO/IEC JTC 1/SC 29/WG 1).
HTJ2K brings an order of magnitude increase in throughput to JPEG 2000 at the expense of slightly reduced coding efficiency.
Plugin features:

* Bare high-throughput JPEG2000 codestream.
* Lossless compression only. For lossy compression use an HTJ2K library and write the chunk directly with `H5Dwrite_chunk`.
* Limited support of datatypes to ensure different HTJ2K libraries can read the chunks: `int8`, `uint8`, `int16`, `uint16`.
* Chunk shapes with at most 3 non-unity dimensions.
* Limited JPEG2000 "components" support: For chunks with 3 non-unity dimensions, the last non-unity dimension must be 3.
* Not limited to a particular HTJ2K implementation.

Plugin's `cd_values[]` are described at https://github.com/silx-kit/h5z-htj2k#filter-cd_values.

Repository: https://github.com/silx-kit/h5z-htj2k.

##### Contact

https://github.com/silx-kit/h5z-htj2k

Comment on lines +918 to +938

@t20100 t20100 Aug 24, 2026

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I just realized this is added before filter ID 32032 while all the other filters are ordered by ID: maybe best to move the htj2k description after BitRound to avoid adding ID 32033 for the next new filter.

@ajelenak ajelenak Aug 25, 2026

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No worries. The registry organizes filter plugins by the filter library family they interface to. In this case it is the JPEG2000 family of compression filters.

---

### BitRound <a name="bitround"></a>
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