imagecodecs


Nameimagecodecs JSON
Version 2024.9.22 PyPI version JSON
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home_pagehttps://www.cgohlke.com
SummaryImage transformation, compression, and decompression codecs
upload_time2024-09-21 19:12:04
maintainerNone
docs_urlNone
authorChristoph Gohlke
requires_python>=3.9
licenseBSD
keywords
VCS
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requirements No requirements were recorded.
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            Image transformation, compression, and decompression codecs
===========================================================

Imagecodecs is a Python library that provides block-oriented, in-memory buffer
transformation, compression, and decompression functions for use in Tifffile,
Czifile, Zarr, kerchunk, and other scientific image input/output packages.

Decode and/or encode functions are implemented for Zlib (DEFLATE), GZIP, LZMA,
ZStandard (ZSTD), Blosc, Brotli, Snappy, BZ2, LZ4, LZ4F, LZ4HC, LZ4H5, LZW,
LZO, LZF, LZFSE, LZHAM, PGLZ (PostgreSQL LZ), RCOMP (Rice), ZFP, SZ3, Pcodec,
SPERR, AEC, SZIP, LERC, EER, NPY, BCn, DDS, BMP, PNG, APNG, GIF, TIFF, WebP,
JPEG 8 and 12-bit, Lossless JPEG (LJPEG, LJ92, JPEGLL), JPEG 2000 (JP2, J2K),
JPEG LS, JPEG XL, JPEG XS, JPEG XR (WDP, HD Photo), Ultra HDR (JPEG_R),
MOZJPEG, AVIF, HEIF, QOI, RGBE (HDR), Jetraw, DICOMRLE, PackBits,
Packed Integers, Delta, XOR Delta, Floating Point Predictor, Bitorder reversal,
Byteshuffle, Bitshuffle, Float24 (24-bit floating point),
Quantize (Scale, BitGroom, BitRound, GranularBR), and
CMS (color space transformations).
Checksum functions are implemented for crc32, adler32, fletcher32, and
Jenkins lookup3.

:Author: `Christoph Gohlke <https://www.cgohlke.com>`_
:License: BSD 3-Clause
:Version: 2024.9.22
:DOI: `10.5281/zenodo.6915978 <https://doi.org/10.5281/zenodo.6915978>`_

Quickstart
----------

Install the imagecodecs package and all dependencies from the
`Python Package Index <https://pypi.org/project/imagecodecs/>`_::

    python -m pip install -U "imagecodecs[all]"

Imagecodecs is also available in other package repositories such as
`Anaconda <https://anaconda.org/conda-forge/imagecodecs>`_,
`MSYS2 <https://packages.msys2.org/base/mingw-w64-python-imagecodecs>`_, and
`MacPorts <https://ports.macports.org/port/py-imagecodecs/summary>`_.

See `Requirements`_ and `Notes`_ for building from source.

See `Examples`_ for using the programming interface.

Source code and support are available on
`GitHub <https://github.com/cgohlke/imagecodecs>`_.

Requirements
------------

This revision was tested with the following requirements and dependencies
(other versions may work):

- `CPython <https://www.python.org>`_ 3.10.11, 3.11.9, 3.12.6, 3.13.0rc2 64-bit
- `Numpy <https://pypi.org/project/numpy>`_ 2.1.1
- `numcodecs <https://pypi.org/project/numcodecs/>`_ 0.13.0
  (optional, for Zarr compatible codecs)

Build requirements:

- `Cython <https://github.com/cython/cython>`_ 3.0.11
- `brotli <https://github.com/google/brotli>`_ 1.1.0
- `brunsli <https://github.com/google/brunsli>`_ 0.1
- `bzip2 <https://gitlab.com/bzip2/bzip2>`_ 1.0.8
- `c-blosc <https://github.com/Blosc/c-blosc>`_ 1.21.6
- `c-blosc2 <https://github.com/Blosc/c-blosc2>`_ 2.15.1
- `charls <https://github.com/team-charls/charls>`_ 2.4.2
- `giflib <https://sourceforge.net/projects/giflib/>`_ 5.2.2
- `jetraw <https://github.com/Jetraw/Jetraw>`_ 23.03.16.4
- `jxrlib <https://github.com/cgohlke/jxrlib>`_ 1.2
- `lcms2 <https://github.com/mm2/Little-CMS>`_ 2.16
- `lerc <https://github.com/Esri/lerc>`_ 4.0.4
- `libaec <https://gitlab.dkrz.de/k202009/libaec>`_ 1.1.3
- `libavif <https://github.com/AOMediaCodec/libavif>`_ 1.1.1
  (`aom <https://aomedia.googlesource.com/aom>`_ 3.10.0,
  `dav1d <https://github.com/videolan/dav1d>`_ 1.4.3,
  `rav1e <https://github.com/xiph/rav1e>`_ 0.7.1,
  `svt-av1 <https://gitlab.com/AOMediaCodec/SVT-AV1>`_ 2.2.1
  `libyuv <https://chromium.googlesource.com/libyuv/libyuv>`_ main)
- `libdeflate <https://github.com/ebiggers/libdeflate>`_ 1.21
- `libheif <https://github.com/strukturag/libheif>`_ 1.18.2
  (`libde265 <https://github.com/strukturag/libde265>`_ 1.0.15,
  `x265 <https://bitbucket.org/multicoreware/x265_git/src/master/>`_ 3.6)
- `libjpeg-turbo <https://github.com/libjpeg-turbo/libjpeg-turbo>`_ 3.0.4
- `libjxl <https://github.com/libjxl/libjxl>`_ 0.11.0
- `libjxs <https://jpeg.org/jpegxs/software.html>`_ 2.0.2
- `liblzma <https://github.com/tukaani-project/xz>`_ 5.6.2
- `libpng <https://github.com/glennrp/libpng>`_ 1.6.44
- `libpng-apng <https://sourceforge.net/projects/libpng-apng/>`_ 1.6.44
- `libtiff <https://gitlab.com/libtiff/libtiff>`_ 4.7.0
- `libultrahdr <https://github.com/google/libultrahdr>`_ 1.2.0
- `libwebp <https://github.com/webmproject/libwebp>`_ 1.4.0
- `lz4 <https://github.com/lz4/lz4>`_ 1.10.0
- `lzfse <https://github.com/lzfse/lzfse/>`_ 1.0
- `lzham_codec <https://github.com/richgel999/lzham_codec/>`_ 1.0
- `lzokay <https://github.com/AxioDL/lzokay>`_ db2df1f
- `mozjpeg <https://github.com/mozilla/mozjpeg>`_ 4.1.5
- `openjpeg <https://github.com/uclouvain/openjpeg>`_ 2.5.2
- `pcodec <https://github.com/mwlon/pcodec>`_ 0.3.1
- `snappy <https://github.com/google/snappy>`_ 1.2.1
- `sperr <https://github.com/NCAR/SPERR>`_ 0.8.2
- `sz3 <https://github.com/szcompressor/SZ3>`_ 3.1.8 (3.2.0 crashes)
- `zfp <https://github.com/LLNL/zfp>`_ 1.0.1
- `zlib <https://github.com/madler/zlib>`_ 1.3.1
- `zlib-ng <https://github.com/zlib-ng/zlib-ng>`_ 2.2.2
- `zopfli <https://github.com/google/zopfli>`_ 1.0.3
- `zstd <https://github.com/facebook/zstd>`_ 1.5.6

Vendored requirements:

- `bcdec.h <https://github.com/iOrange/bcdec>`_ 3b29f8f
- `bitshuffle <https://github.com/kiyo-masui/bitshuffle>`_ 0.5.1
- `cfitsio ricecomp.c <https://heasarc.gsfc.nasa.gov/fitsio/>`_ modified
- `h5checksum.c <https://github.com/HDFGroup/hdf5/>`_ modified
- `jpg_0XC3.cpp
  <https://github.com/rordenlab/dcm2niix/blob/master/console/jpg_0XC3.cpp>`_
  modified
- `liblj92
  <https://bitbucket.org/baldand/mlrawviewer/src/master/liblj92/>`_ modified
- `liblzf <http://oldhome.schmorp.de/marc/liblzf.html>`_ 3.6
- `libspng <https://github.com/randy408/libspng>`_ 0.7.4
- `nc4var.c <https://github.com/Unidata/netcdf-c/blob/main/libsrc4/nc4var.c>`_
  modified
- `pg_lzcompress.c <https://github.com/postgres/postgres>`_ modified
- `qoi.h <https://github.com/phoboslab/qoi/>`_ 36190eb
- `rgbe.c <https://www.graphics.cornell.edu/~bjw/rgbe/rgbe.c>`_ modified

Test requirements:

- `tifffile <https://pypi.org/project/tifffile>`_ 2024.9.20
- `czifile <https://pypi.org/project/czifile>`_ 2019.7.2
- `zarr <https://github.com/zarr-developers/zarr-python>`_ 2.18.2
- `python-blosc <https://github.com/Blosc/python-blosc>`_ 1.11.2
- `python-blosc2 <https://github.com/Blosc/python-blosc2>`_ 2.7.1
- `python-brotli <https://github.com/google/brotli/tree/master/python>`_ 1.0.9
- `python-lz4 <https://github.com/python-lz4/python-lz4>`_ 4.3.3
- `python-lzf <https://github.com/teepark/python-lzf>`_ 0.2.6
- `python-snappy <https://github.com/andrix/python-snappy>`_ 0.7.2
- `python-zstd <https://github.com/sergey-dryabzhinsky/python-zstd>`_ 1.5.5.1
- `pyliblzfse <https://github.com/ydkhatri/pyliblzfse>`_ 0.4.1
- `zopflipy <https://github.com/hattya/zopflipy>`_ 1.10

Revisions
---------

2024.9.22

- Pass 7644 tests.
- Use libjpeg-turbo for all Lossless JPEG bit-depths if possible (#105).
- Fix PackBits encoder fails to skip short replication blocks (#107).
- Fix JPEG2K encoder leaving trailing random bytes (#104).
- Fix encoding and decoding JPEG XL with custom bitspersample (#102).
- Improve error handling in lzf_decode (#103).
- Add Ultra HDR (JPEG_R) codec based on libultrahdr library (#108).
- Add JPEGXS codec based on libjxs library (source only).
- Add SZ3 codec based on SZ3 library.
- Deprecate Python 3.9, support Python 3.13.

2024.6.1

- Fix segfault in sperr_decode.
- Fix segfault when strided-decoding into buffers with unexpected shapes (#98).
- Fix jpeg2k_encoder output buffer too small (#101).
- Add PCODEC codec based on pcodec library.
- Support NumPy 2.

2024.1.1

- Add 8/24-bit BMP codec.
- Add SPERR codec based on SPERR library.
- Add LZO decoder based on lzokay library.
- Add DICOMRLE decoder.
- Enable float16 in CMS codec.
- Enable MCT for lossless JPEG2K encoder (#88).
- Ignore pad-byte in PackBits decoder (#86).
- Fix heif_write_callback error message not set.
- Require lcms2 2.16 with issue-420 fixes.
- Require libjxl 0.9, libaec 1.1, Cython 3.

2023.9.18

- Rebuild with updated dependencies fixes CVE-2024-4863.

2023.9.4

- Map avif_encode level parameter to quality (breaking).
- Support monochrome images in avif_encode.
- Add numthreads parameter to avif_decode (fix imread of AVIF).
- Add quantize filter (BitGroom, BitRound, GBR) via nc4var.c.
- Add LZ4H5 codec.
- Support more BCn compressed DDS fourcc types.
- Require libavif 1.0.

2023.8.12

- Add EER (Electron Event Representation) decoder.
- Add option to pass initial value to crc32 and adler32 checksum functions.
- Add fletcher32 and lookup3 checksum functions via HDF5's h5checksum.c.
- Add Checksum codec for numcodecs.

2023.7.10

- Rebuild with optimized compile flags.

2023.7.4

- Add BCn and DDS decoder via bcdec library.
- Add functions to transcode JPEG XL to/from JPEG (#78).
- Add option to decode select frames from animated WebP.
- Use legacy JPEG8 codec when building without libjpeg-turbo 3 (#65).
- Change blosc2_encode defaults to match blosc2-python (breaking).
- Fix segfault writing JPEG2K with more than 4 samples.
- Fix some codecs returning bytearray by default.
- Fully vendor cfitsio's ricecomp.c.
- Drop support for Python 3.8 and numpy < 1.21 (NEP29).

- …

Refer to the CHANGES file for older revisions.

Objectives
----------

Many scientific image storage formats like TIFF, CZI, DICOM, HDF, and Zarr
are containers that hold large numbers of small data segments (chunks, tiles,
stripes), which are encoded using a variety of compression and pre-filtering
methods. Metadata common to all data segments are typically stored separate
from the segments.

The purpose of the Imagecodecs library is to support Python modules in
encoding and decoding such data segments. The specific aims are:

- Provide functions for encoding and decoding small image data segments
  in-memory (not in-file) from and to bytes or numpy arrays for many
  compression and filtering methods.
- Support image formats and compression methods not available elsewhere in
  the Python ecosystem.
- Reduce the runtime dependency on numerous, large, inapt, or unmaintained
  Python packages. The imagecodecs package only depends on numpy.
- Implement codecs as Cython wrappers of 3rd party libraries with a C API
  and permissive license if exists, else use own C library.
  Provide Cython definition files for the wrapped C libraries.
- Release the Python global interpreter lock (GIL) during extended native/C
  function calls for multi-threaded use.

Accessing parts of large data segments and reading metadata from segments
are out of the scope of this library.

Notes
-----

This library is largely a work in progress.

The API is not stable yet and might change between revisions.

Python <= 3.8 is no longer supported. 32-bit versions are deprecated.

Works on little-endian platforms only.

Supported platforms are ``win_amd64``, ``win_arm64``, ``win32``,
``macosx_x86_64``, ``macosx_arm64``, ``manylinux_x86_64``, and
``manylinux_aarch64``.

Wheels may not be available for all platforms and all releases.

Only the ``win_amd64`` wheels include all features.

The ``tiff``, ``bcn``, ``dds``, ``dicomrle``, ``eer``, ``lzo``, ``packints``,
and ``jpegsof3`` codecs are currently decode-only.

The ``heif``, ``jetraw``, and ``jpegxs`` codecs are distributed as source
code only due to license and possible patent usage issues.

The latest `Microsoft Visual C++ Redistributable for Visual Studio 2015-2022
<https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist>`_
is required on Windows.

Refer to the imagecodecs/licenses folder for 3rd-party library licenses.

This software is based in part on the work of the Independent JPEG Group.

Update pip and setuptools to the latest version before installing imagecodecs::

    python -m pip install -U pip setuptools wheel Cython

Before building imagecodecs from source code, install required tools and
libraries. For example, on latest Ubuntu Linux distributions:

    ``sudo apt-get install build-essential python3-dev cython3 python3-pip
    python3-setuptools python3-wheel python3-numpy libdeflate-dev libjpeg-dev
    libjxr-dev liblcms2-dev liblz4-dev liblerc-dev liblzma-dev libopenjp2-7-dev
    libpng-dev libtiff-dev libwebp-dev libz-dev libzstd-dev``

To build and install imagecodecs from source code, run::

    python -m pip install .

Many extensions are disabled by default when building from source.

To define which extensions are built, or to modify build settings such as
library names and compiler arguments, provide a
``imagecodecs_distributor_setup.customize_build`` function, which is
imported and executed during setup.
See ``setup.py`` for pre-defined ``customize_build`` functions.

Other projects providing imaging or compression codecs:
`Python zlib <https://docs.python.org/3/library/zlib.html>`_,
`Python bz2 <https://docs.python.org/3/library/bz2.html>`_,
`Python lzma <https://docs.python.org/3/library/lzma.html>`_,
`backports.lzma <https://github.com/peterjc/backports.lzma>`_,
`python-lzo <https://bitbucket.org/james_taylor/python-lzo-static>`_,
`python-lzw <https://github.com/joeatwork/python-lzw>`_,
`python-lerc <https://pypi.org/project/lerc/>`_,
`wavpack-numcodecs
<https://github.com/AllenNeuralDynamics/wavpack-numcodecs>`_,
`packbits <https://github.com/psd-tools/packbits>`_,
`isa-l.igzip <https://github.com/intel/isa-l>`_,
`fpzip <https://github.com/seung-lab/fpzip>`_,
`libmng <https://sourceforge.net/projects/libmng/>`_,
`OpenEXR <https://github.com/AcademySoftwareFoundation/openexr>`_
(EXR, PIZ, PXR24, B44, DWA),
`pyJetraw <https://github.com/Jetraw/pyJetraw>`_,
`tinyexr <https://github.com/syoyo/tinyexr>`_,
`pytinyexr <https://github.com/syoyo/pytinyexr>`_,
`pyroexr <https://github.com/dragly/pyroexr>`_,
`JasPer <https://github.com/jasper-software/jasper>`_,
`libjpeg <https://github.com/thorfdbg/libjpeg>`_ (GPL),
`pylibjpeg <https://github.com/pydicom/pylibjpeg>`_,
`pylibjpeg-libjpeg <https://github.com/pydicom/pylibjpeg-libjpeg>`_ (GPL),
`pylibjpeg-openjpeg <https://github.com/pydicom/pylibjpeg-openjpeg>`_,
`pylibjpeg-rle <https://github.com/pydicom/pylibjpeg-rle>`_,
`glymur <https://github.com/quintusdias/glymur>`_,
`pyheif <https://github.com/carsales/pyheif>`_,
`pyrus-cramjam <https://github.com/milesgranger/pyrus-cramjam>`_,
`PyLZHAM <https://github.com/Galaxy1036/pylzham>`_,
`BriefLZ <https://github.com/jibsen/brieflz>`_,
`QuickLZ <http://www.quicklz.com/>`_ (GPL),
`LZO <http://www.oberhumer.com/opensource/lzo/>`_ (GPL),
`nvJPEG <https://developer.nvidia.com/nvjpeg>`_,
`nvJPEG2K <https://developer.nvidia.com/nvjpeg>`_,
`PyTurboJPEG <https://github.com/lilohuang/PyTurboJPEG>`_,
`CCSDS123 <https://github.com/drowzie/CCSDS123-Issue-2>`_,
`LPC-Rice <https://sourceforge.net/projects/lpcrice/>`_,
`CompressionAlgorithms <https://github.com/glampert/compression-algorithms>`_,
`Compressonator <https://github.com/GPUOpen-Tools/Compressonator>`_,
`Wuffs <https://github.com/google/wuffs>`_,
`TinyDNG <https://github.com/syoyo/tinydng>`_,
`OpenJPH <https://github.com/aous72/OpenJPH>`_,
`Grok <https://github.com/GrokImageCompression/grok>`_ (AGPL),
`MAFISC
<https://wr.informatik.uni-hamburg.de/research/projects/icomex/mafisc>`_,
`B3D <https://github.com/balintbalazs/B3D>`_,
`fo-dicom.Codecs <https://github.com/Efferent-Health/fo-dicom.Codecs>`_,
`jpegli <https://github.com/google/jpegli>`_.

Examples
--------

Import the JPEG2K codec:

>>> from imagecodecs import (
...     jpeg2k_encode,
...     jpeg2k_decode,
...     jpeg2k_check,
...     jpeg2k_version,
...     JPEG2K,
... )

Check that the JPEG2K codec is available in the imagecodecs build:

>>> JPEG2K.available
True

Print the version of the JPEG2K codec's underlying OpenJPEG library:

>>> jpeg2k_version()
'openjpeg 2.5.2'

Encode a numpy array in lossless JP2 format:

>>> array = numpy.random.randint(100, 200, (256, 256, 3), numpy.uint8)
>>> encoded = jpeg2k_encode(array, level=0)
>>> bytes(encoded[:12])
b'\x00\x00\x00\x0cjP  \r\n\x87\n'

Check that the encoded bytes likely contain a JPEG 2000 stream:

>>> jpeg2k_check(encoded)
True

Decode the JP2 encoded bytes to a numpy array:

>>> decoded = jpeg2k_decode(encoded)
>>> numpy.array_equal(decoded, array)
True

Decode the JP2 encoded bytes to an existing numpy array:

>>> out = numpy.empty_like(array)
>>> _ = jpeg2k_decode(encoded, out=out)
>>> numpy.array_equal(out, array)
True

Not all codecs are fully implemented, raising exceptions at runtime:

>>> from imagecodecs import tiff_encode
>>> tiff_encode(array)
Traceback (most recent call last):
 ...
NotImplementedError: tiff_encode

Write the numpy array to a JP2 file:

>>> from imagecodecs import imwrite, imread
>>> imwrite('_test.jp2', array)

Read the image from the JP2 file as numpy array:

>>> image = imread('_test.jp2')
>>> numpy.array_equal(image, array)
True

Create a JPEG 2000 compressed Zarr array:

>>> import zarr
>>> import numcodecs
>>> from imagecodecs.numcodecs import Jpeg2k
>>> numcodecs.register_codec(Jpeg2k)
>>> zarr.zeros(
...     (4, 5, 512, 512, 3),
...     chunks=(1, 1, 256, 256, 3),
...     dtype='u1',
...     compressor=Jpeg2k(),
... )
<zarr.core.Array (4, 5, 512, 512, 3) uint8>

Access image data in a sequence of JP2 files via tifffile.FileSequence and
dask.array:

>>> import tifffile
>>> import dask.array
>>> def jp2_read(filename):
...     with open(filename, 'rb') as fh:
...         data = fh.read()
...     return jpeg2k_decode(data)
...
>>> with tifffile.FileSequence(jp2_read, '*.jp2') as ims:
...     with ims.aszarr() as store:
...         dask.array.from_zarr(store)
...
dask.array<from-zarr, shape=(1, 256, 256, 3)...chunksize=(1, 256, 256, 3)...

Write the Zarr store to a fsspec ReferenceFileSystem in JSON format
and open it as a Zarr array:

>>> store.write_fsspec(
...     'temp.json', url='file://', codec_id='imagecodecs_jpeg2k'
... )
>>> import fsspec
>>> mapper = fsspec.get_mapper(
...     'reference://', fo='temp.json', target_protocol='file'
... )
>>> zarr.open(mapper, mode='r')
<zarr.core.Array (1, 256, 256, 3) uint8 read-only>

View the image in the JP2 file from the command line::

    python -m imagecodecs _test.jp2

            

Raw data

            {
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    "name": "imagecodecs",
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    "requires_python": ">=3.9",
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    "keywords": null,
    "author": "Christoph Gohlke",
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    "download_url": "https://files.pythonhosted.org/packages/55/d8/dae2c21b5942627f6f540aabe5b58827a4367870a3cd36a81aa04f9aaf65/imagecodecs-2024.9.22.tar.gz",
    "platform": "any",
    "description": "Image transformation, compression, and decompression codecs\n===========================================================\n\nImagecodecs is a Python library that provides block-oriented, in-memory buffer\ntransformation, compression, and decompression functions for use in Tifffile,\nCzifile, Zarr, kerchunk, and other scientific image input/output packages.\n\nDecode and/or encode functions are implemented for Zlib (DEFLATE), GZIP, LZMA,\nZStandard (ZSTD), Blosc, Brotli, Snappy, BZ2, LZ4, LZ4F, LZ4HC, LZ4H5, LZW,\nLZO, LZF, LZFSE, LZHAM, PGLZ (PostgreSQL LZ), RCOMP (Rice), ZFP, SZ3, Pcodec,\nSPERR, AEC, SZIP, LERC, EER, NPY, BCn, DDS, BMP, PNG, APNG, GIF, TIFF, WebP,\nJPEG 8 and 12-bit, Lossless JPEG (LJPEG, LJ92, JPEGLL), JPEG 2000 (JP2, J2K),\nJPEG LS, JPEG XL, JPEG XS, JPEG XR (WDP, HD Photo), Ultra HDR (JPEG_R),\nMOZJPEG, AVIF, HEIF, QOI, RGBE (HDR), Jetraw, DICOMRLE, PackBits,\nPacked Integers, Delta, XOR Delta, Floating Point Predictor, Bitorder reversal,\nByteshuffle, Bitshuffle, Float24 (24-bit floating point),\nQuantize (Scale, BitGroom, BitRound, GranularBR), and\nCMS (color space transformations).\nChecksum functions are implemented for crc32, adler32, fletcher32, and\nJenkins lookup3.\n\n:Author: `Christoph Gohlke <https://www.cgohlke.com>`_\n:License: BSD 3-Clause\n:Version: 2024.9.22\n:DOI: `10.5281/zenodo.6915978 <https://doi.org/10.5281/zenodo.6915978>`_\n\nQuickstart\n----------\n\nInstall the imagecodecs package and all dependencies from the\n`Python Package Index <https://pypi.org/project/imagecodecs/>`_::\n\n    python -m pip install -U \"imagecodecs[all]\"\n\nImagecodecs is also available in other package repositories such as\n`Anaconda <https://anaconda.org/conda-forge/imagecodecs>`_,\n`MSYS2 <https://packages.msys2.org/base/mingw-w64-python-imagecodecs>`_, and\n`MacPorts <https://ports.macports.org/port/py-imagecodecs/summary>`_.\n\nSee `Requirements`_ and `Notes`_ for building from source.\n\nSee `Examples`_ for using the programming interface.\n\nSource code and support are available on\n`GitHub <https://github.com/cgohlke/imagecodecs>`_.\n\nRequirements\n------------\n\nThis revision was tested with the following requirements and dependencies\n(other versions may work):\n\n- `CPython <https://www.python.org>`_ 3.10.11, 3.11.9, 3.12.6, 3.13.0rc2 64-bit\n- `Numpy <https://pypi.org/project/numpy>`_ 2.1.1\n- `numcodecs <https://pypi.org/project/numcodecs/>`_ 0.13.0\n  (optional, for Zarr compatible codecs)\n\nBuild requirements:\n\n- `Cython <https://github.com/cython/cython>`_ 3.0.11\n- `brotli <https://github.com/google/brotli>`_ 1.1.0\n- `brunsli <https://github.com/google/brunsli>`_ 0.1\n- `bzip2 <https://gitlab.com/bzip2/bzip2>`_ 1.0.8\n- `c-blosc <https://github.com/Blosc/c-blosc>`_ 1.21.6\n- `c-blosc2 <https://github.com/Blosc/c-blosc2>`_ 2.15.1\n- `charls <https://github.com/team-charls/charls>`_ 2.4.2\n- `giflib <https://sourceforge.net/projects/giflib/>`_ 5.2.2\n- `jetraw <https://github.com/Jetraw/Jetraw>`_ 23.03.16.4\n- `jxrlib <https://github.com/cgohlke/jxrlib>`_ 1.2\n- `lcms2 <https://github.com/mm2/Little-CMS>`_ 2.16\n- `lerc <https://github.com/Esri/lerc>`_ 4.0.4\n- `libaec <https://gitlab.dkrz.de/k202009/libaec>`_ 1.1.3\n- `libavif <https://github.com/AOMediaCodec/libavif>`_ 1.1.1\n  (`aom <https://aomedia.googlesource.com/aom>`_ 3.10.0,\n  `dav1d <https://github.com/videolan/dav1d>`_ 1.4.3,\n  `rav1e <https://github.com/xiph/rav1e>`_ 0.7.1,\n  `svt-av1 <https://gitlab.com/AOMediaCodec/SVT-AV1>`_ 2.2.1\n  `libyuv <https://chromium.googlesource.com/libyuv/libyuv>`_ main)\n- `libdeflate <https://github.com/ebiggers/libdeflate>`_ 1.21\n- `libheif <https://github.com/strukturag/libheif>`_ 1.18.2\n  (`libde265 <https://github.com/strukturag/libde265>`_ 1.0.15,\n  `x265 <https://bitbucket.org/multicoreware/x265_git/src/master/>`_ 3.6)\n- `libjpeg-turbo <https://github.com/libjpeg-turbo/libjpeg-turbo>`_ 3.0.4\n- `libjxl <https://github.com/libjxl/libjxl>`_ 0.11.0\n- `libjxs <https://jpeg.org/jpegxs/software.html>`_ 2.0.2\n- `liblzma <https://github.com/tukaani-project/xz>`_ 5.6.2\n- `libpng <https://github.com/glennrp/libpng>`_ 1.6.44\n- `libpng-apng <https://sourceforge.net/projects/libpng-apng/>`_ 1.6.44\n- `libtiff <https://gitlab.com/libtiff/libtiff>`_ 4.7.0\n- `libultrahdr <https://github.com/google/libultrahdr>`_ 1.2.0\n- `libwebp <https://github.com/webmproject/libwebp>`_ 1.4.0\n- `lz4 <https://github.com/lz4/lz4>`_ 1.10.0\n- `lzfse <https://github.com/lzfse/lzfse/>`_ 1.0\n- `lzham_codec <https://github.com/richgel999/lzham_codec/>`_ 1.0\n- `lzokay <https://github.com/AxioDL/lzokay>`_ db2df1f\n- `mozjpeg <https://github.com/mozilla/mozjpeg>`_ 4.1.5\n- `openjpeg <https://github.com/uclouvain/openjpeg>`_ 2.5.2\n- `pcodec <https://github.com/mwlon/pcodec>`_ 0.3.1\n- `snappy <https://github.com/google/snappy>`_ 1.2.1\n- `sperr <https://github.com/NCAR/SPERR>`_ 0.8.2\n- `sz3 <https://github.com/szcompressor/SZ3>`_ 3.1.8 (3.2.0 crashes)\n- `zfp <https://github.com/LLNL/zfp>`_ 1.0.1\n- `zlib <https://github.com/madler/zlib>`_ 1.3.1\n- `zlib-ng <https://github.com/zlib-ng/zlib-ng>`_ 2.2.2\n- `zopfli <https://github.com/google/zopfli>`_ 1.0.3\n- `zstd <https://github.com/facebook/zstd>`_ 1.5.6\n\nVendored requirements:\n\n- `bcdec.h <https://github.com/iOrange/bcdec>`_ 3b29f8f\n- `bitshuffle <https://github.com/kiyo-masui/bitshuffle>`_ 0.5.1\n- `cfitsio ricecomp.c <https://heasarc.gsfc.nasa.gov/fitsio/>`_ modified\n- `h5checksum.c <https://github.com/HDFGroup/hdf5/>`_ modified\n- `jpg_0XC3.cpp\n  <https://github.com/rordenlab/dcm2niix/blob/master/console/jpg_0XC3.cpp>`_\n  modified\n- `liblj92\n  <https://bitbucket.org/baldand/mlrawviewer/src/master/liblj92/>`_ modified\n- `liblzf <http://oldhome.schmorp.de/marc/liblzf.html>`_ 3.6\n- `libspng <https://github.com/randy408/libspng>`_ 0.7.4\n- `nc4var.c <https://github.com/Unidata/netcdf-c/blob/main/libsrc4/nc4var.c>`_\n  modified\n- `pg_lzcompress.c <https://github.com/postgres/postgres>`_ modified\n- `qoi.h <https://github.com/phoboslab/qoi/>`_ 36190eb\n- `rgbe.c <https://www.graphics.cornell.edu/~bjw/rgbe/rgbe.c>`_ modified\n\nTest requirements:\n\n- `tifffile <https://pypi.org/project/tifffile>`_ 2024.9.20\n- `czifile <https://pypi.org/project/czifile>`_ 2019.7.2\n- `zarr <https://github.com/zarr-developers/zarr-python>`_ 2.18.2\n- `python-blosc <https://github.com/Blosc/python-blosc>`_ 1.11.2\n- `python-blosc2 <https://github.com/Blosc/python-blosc2>`_ 2.7.1\n- `python-brotli <https://github.com/google/brotli/tree/master/python>`_ 1.0.9\n- `python-lz4 <https://github.com/python-lz4/python-lz4>`_ 4.3.3\n- `python-lzf <https://github.com/teepark/python-lzf>`_ 0.2.6\n- `python-snappy <https://github.com/andrix/python-snappy>`_ 0.7.2\n- `python-zstd <https://github.com/sergey-dryabzhinsky/python-zstd>`_ 1.5.5.1\n- `pyliblzfse <https://github.com/ydkhatri/pyliblzfse>`_ 0.4.1\n- `zopflipy <https://github.com/hattya/zopflipy>`_ 1.10\n\nRevisions\n---------\n\n2024.9.22\n\n- Pass 7644 tests.\n- Use libjpeg-turbo for all Lossless JPEG bit-depths if possible (#105).\n- Fix PackBits encoder fails to skip short replication blocks (#107).\n- Fix JPEG2K encoder leaving trailing random bytes (#104).\n- Fix encoding and decoding JPEG XL with custom bitspersample (#102).\n- Improve error handling in lzf_decode (#103).\n- Add Ultra HDR (JPEG_R) codec based on libultrahdr library (#108).\n- Add JPEGXS codec based on libjxs library (source only).\n- Add SZ3 codec based on SZ3 library.\n- Deprecate Python 3.9, support Python 3.13.\n\n2024.6.1\n\n- Fix segfault in sperr_decode.\n- Fix segfault when strided-decoding into buffers with unexpected shapes (#98).\n- Fix jpeg2k_encoder output buffer too small (#101).\n- Add PCODEC codec based on pcodec library.\n- Support NumPy 2.\n\n2024.1.1\n\n- Add 8/24-bit BMP codec.\n- Add SPERR codec based on SPERR library.\n- Add LZO decoder based on lzokay library.\n- Add DICOMRLE decoder.\n- Enable float16 in CMS codec.\n- Enable MCT for lossless JPEG2K encoder (#88).\n- Ignore pad-byte in PackBits decoder (#86).\n- Fix heif_write_callback error message not set.\n- Require lcms2 2.16 with issue-420 fixes.\n- Require libjxl 0.9, libaec 1.1, Cython 3.\n\n2023.9.18\n\n- Rebuild with updated dependencies fixes CVE-2024-4863.\n\n2023.9.4\n\n- Map avif_encode level parameter to quality (breaking).\n- Support monochrome images in avif_encode.\n- Add numthreads parameter to avif_decode (fix imread of AVIF).\n- Add quantize filter (BitGroom, BitRound, GBR) via nc4var.c.\n- Add LZ4H5 codec.\n- Support more BCn compressed DDS fourcc types.\n- Require libavif 1.0.\n\n2023.8.12\n\n- Add EER (Electron Event Representation) decoder.\n- Add option to pass initial value to crc32 and adler32 checksum functions.\n- Add fletcher32 and lookup3 checksum functions via HDF5's h5checksum.c.\n- Add Checksum codec for numcodecs.\n\n2023.7.10\n\n- Rebuild with optimized compile flags.\n\n2023.7.4\n\n- Add BCn and DDS decoder via bcdec library.\n- Add functions to transcode JPEG XL to/from JPEG (#78).\n- Add option to decode select frames from animated WebP.\n- Use legacy JPEG8 codec when building without libjpeg-turbo 3 (#65).\n- Change blosc2_encode defaults to match blosc2-python (breaking).\n- Fix segfault writing JPEG2K with more than 4 samples.\n- Fix some codecs returning bytearray by default.\n- Fully vendor cfitsio's ricecomp.c.\n- Drop support for Python 3.8 and numpy < 1.21 (NEP29).\n\n- \u2026\n\nRefer to the CHANGES file for older revisions.\n\nObjectives\n----------\n\nMany scientific image storage formats like TIFF, CZI, DICOM, HDF, and Zarr\nare containers that hold large numbers of small data segments (chunks, tiles,\nstripes), which are encoded using a variety of compression and pre-filtering\nmethods. Metadata common to all data segments are typically stored separate\nfrom the segments.\n\nThe purpose of the Imagecodecs library is to support Python modules in\nencoding and decoding such data segments. The specific aims are:\n\n- Provide functions for encoding and decoding small image data segments\n  in-memory (not in-file) from and to bytes or numpy arrays for many\n  compression and filtering methods.\n- Support image formats and compression methods not available elsewhere in\n  the Python ecosystem.\n- Reduce the runtime dependency on numerous, large, inapt, or unmaintained\n  Python packages. The imagecodecs package only depends on numpy.\n- Implement codecs as Cython wrappers of 3rd party libraries with a C API\n  and permissive license if exists, else use own C library.\n  Provide Cython definition files for the wrapped C libraries.\n- Release the Python global interpreter lock (GIL) during extended native/C\n  function calls for multi-threaded use.\n\nAccessing parts of large data segments and reading metadata from segments\nare out of the scope of this library.\n\nNotes\n-----\n\nThis library is largely a work in progress.\n\nThe API is not stable yet and might change between revisions.\n\nPython <= 3.8 is no longer supported. 32-bit versions are deprecated.\n\nWorks on little-endian platforms only.\n\nSupported platforms are ``win_amd64``, ``win_arm64``, ``win32``,\n``macosx_x86_64``, ``macosx_arm64``, ``manylinux_x86_64``, and\n``manylinux_aarch64``.\n\nWheels may not be available for all platforms and all releases.\n\nOnly the ``win_amd64`` wheels include all features.\n\nThe ``tiff``, ``bcn``, ``dds``, ``dicomrle``, ``eer``, ``lzo``, ``packints``,\nand ``jpegsof3`` codecs are currently decode-only.\n\nThe ``heif``, ``jetraw``, and ``jpegxs`` codecs are distributed as source\ncode only due to license and possible patent usage issues.\n\nThe latest `Microsoft Visual C++ Redistributable for Visual Studio 2015-2022\n<https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist>`_\nis required on Windows.\n\nRefer to the imagecodecs/licenses folder for 3rd-party library licenses.\n\nThis software is based in part on the work of the Independent JPEG Group.\n\nUpdate pip and setuptools to the latest version before installing imagecodecs::\n\n    python -m pip install -U pip setuptools wheel Cython\n\nBefore building imagecodecs from source code, install required tools and\nlibraries. For example, on latest Ubuntu Linux distributions:\n\n    ``sudo apt-get install build-essential python3-dev cython3 python3-pip\n    python3-setuptools python3-wheel python3-numpy libdeflate-dev libjpeg-dev\n    libjxr-dev liblcms2-dev liblz4-dev liblerc-dev liblzma-dev libopenjp2-7-dev\n    libpng-dev libtiff-dev libwebp-dev libz-dev libzstd-dev``\n\nTo build and install imagecodecs from source code, run::\n\n    python -m pip install .\n\nMany extensions are disabled by default when building from source.\n\nTo define which extensions are built, or to modify build settings such as\nlibrary names and compiler arguments, provide a\n``imagecodecs_distributor_setup.customize_build`` function, which is\nimported and executed during setup.\nSee ``setup.py`` for pre-defined ``customize_build`` functions.\n\nOther projects providing imaging or compression codecs:\n`Python zlib <https://docs.python.org/3/library/zlib.html>`_,\n`Python bz2 <https://docs.python.org/3/library/bz2.html>`_,\n`Python lzma <https://docs.python.org/3/library/lzma.html>`_,\n`backports.lzma <https://github.com/peterjc/backports.lzma>`_,\n`python-lzo <https://bitbucket.org/james_taylor/python-lzo-static>`_,\n`python-lzw <https://github.com/joeatwork/python-lzw>`_,\n`python-lerc <https://pypi.org/project/lerc/>`_,\n`wavpack-numcodecs\n<https://github.com/AllenNeuralDynamics/wavpack-numcodecs>`_,\n`packbits <https://github.com/psd-tools/packbits>`_,\n`isa-l.igzip <https://github.com/intel/isa-l>`_,\n`fpzip <https://github.com/seung-lab/fpzip>`_,\n`libmng <https://sourceforge.net/projects/libmng/>`_,\n`OpenEXR <https://github.com/AcademySoftwareFoundation/openexr>`_\n(EXR, PIZ, PXR24, B44, DWA),\n`pyJetraw <https://github.com/Jetraw/pyJetraw>`_,\n`tinyexr <https://github.com/syoyo/tinyexr>`_,\n`pytinyexr <https://github.com/syoyo/pytinyexr>`_,\n`pyroexr <https://github.com/dragly/pyroexr>`_,\n`JasPer <https://github.com/jasper-software/jasper>`_,\n`libjpeg <https://github.com/thorfdbg/libjpeg>`_ (GPL),\n`pylibjpeg <https://github.com/pydicom/pylibjpeg>`_,\n`pylibjpeg-libjpeg <https://github.com/pydicom/pylibjpeg-libjpeg>`_ (GPL),\n`pylibjpeg-openjpeg <https://github.com/pydicom/pylibjpeg-openjpeg>`_,\n`pylibjpeg-rle <https://github.com/pydicom/pylibjpeg-rle>`_,\n`glymur <https://github.com/quintusdias/glymur>`_,\n`pyheif <https://github.com/carsales/pyheif>`_,\n`pyrus-cramjam <https://github.com/milesgranger/pyrus-cramjam>`_,\n`PyLZHAM <https://github.com/Galaxy1036/pylzham>`_,\n`BriefLZ <https://github.com/jibsen/brieflz>`_,\n`QuickLZ <http://www.quicklz.com/>`_ (GPL),\n`LZO <http://www.oberhumer.com/opensource/lzo/>`_ (GPL),\n`nvJPEG <https://developer.nvidia.com/nvjpeg>`_,\n`nvJPEG2K <https://developer.nvidia.com/nvjpeg>`_,\n`PyTurboJPEG <https://github.com/lilohuang/PyTurboJPEG>`_,\n`CCSDS123 <https://github.com/drowzie/CCSDS123-Issue-2>`_,\n`LPC-Rice <https://sourceforge.net/projects/lpcrice/>`_,\n`CompressionAlgorithms <https://github.com/glampert/compression-algorithms>`_,\n`Compressonator <https://github.com/GPUOpen-Tools/Compressonator>`_,\n`Wuffs <https://github.com/google/wuffs>`_,\n`TinyDNG <https://github.com/syoyo/tinydng>`_,\n`OpenJPH <https://github.com/aous72/OpenJPH>`_,\n`Grok <https://github.com/GrokImageCompression/grok>`_ (AGPL),\n`MAFISC\n<https://wr.informatik.uni-hamburg.de/research/projects/icomex/mafisc>`_,\n`B3D <https://github.com/balintbalazs/B3D>`_,\n`fo-dicom.Codecs <https://github.com/Efferent-Health/fo-dicom.Codecs>`_,\n`jpegli <https://github.com/google/jpegli>`_.\n\nExamples\n--------\n\nImport the JPEG2K codec:\n\n>>> from imagecodecs import (\n...     jpeg2k_encode,\n...     jpeg2k_decode,\n...     jpeg2k_check,\n...     jpeg2k_version,\n...     JPEG2K,\n... )\n\nCheck that the JPEG2K codec is available in the imagecodecs build:\n\n>>> JPEG2K.available\nTrue\n\nPrint the version of the JPEG2K codec's underlying OpenJPEG library:\n\n>>> jpeg2k_version()\n'openjpeg 2.5.2'\n\nEncode a numpy array in lossless JP2 format:\n\n>>> array = numpy.random.randint(100, 200, (256, 256, 3), numpy.uint8)\n>>> encoded = jpeg2k_encode(array, level=0)\n>>> bytes(encoded[:12])\nb'\\x00\\x00\\x00\\x0cjP  \\r\\n\\x87\\n'\n\nCheck that the encoded bytes likely contain a JPEG 2000 stream:\n\n>>> jpeg2k_check(encoded)\nTrue\n\nDecode the JP2 encoded bytes to a numpy array:\n\n>>> decoded = jpeg2k_decode(encoded)\n>>> numpy.array_equal(decoded, array)\nTrue\n\nDecode the JP2 encoded bytes to an existing numpy array:\n\n>>> out = numpy.empty_like(array)\n>>> _ = jpeg2k_decode(encoded, out=out)\n>>> numpy.array_equal(out, array)\nTrue\n\nNot all codecs are fully implemented, raising exceptions at runtime:\n\n>>> from imagecodecs import tiff_encode\n>>> tiff_encode(array)\nTraceback (most recent call last):\n ...\nNotImplementedError: tiff_encode\n\nWrite the numpy array to a JP2 file:\n\n>>> from imagecodecs import imwrite, imread\n>>> imwrite('_test.jp2', array)\n\nRead the image from the JP2 file as numpy array:\n\n>>> image = imread('_test.jp2')\n>>> numpy.array_equal(image, array)\nTrue\n\nCreate a JPEG 2000 compressed Zarr array:\n\n>>> import zarr\n>>> import numcodecs\n>>> from imagecodecs.numcodecs import Jpeg2k\n>>> numcodecs.register_codec(Jpeg2k)\n>>> zarr.zeros(\n...     (4, 5, 512, 512, 3),\n...     chunks=(1, 1, 256, 256, 3),\n...     dtype='u1',\n...     compressor=Jpeg2k(),\n... )\n<zarr.core.Array (4, 5, 512, 512, 3) uint8>\n\nAccess image data in a sequence of JP2 files via tifffile.FileSequence and\ndask.array:\n\n>>> import tifffile\n>>> import dask.array\n>>> def jp2_read(filename):\n...     with open(filename, 'rb') as fh:\n...         data = fh.read()\n...     return jpeg2k_decode(data)\n...\n>>> with tifffile.FileSequence(jp2_read, '*.jp2') as ims:\n...     with ims.aszarr() as store:\n...         dask.array.from_zarr(store)\n...\ndask.array<from-zarr, shape=(1, 256, 256, 3)...chunksize=(1, 256, 256, 3)...\n\nWrite the Zarr store to a fsspec ReferenceFileSystem in JSON format\nand open it as a Zarr array:\n\n>>> store.write_fsspec(\n...     'temp.json', url='file://', codec_id='imagecodecs_jpeg2k'\n... )\n>>> import fsspec\n>>> mapper = fsspec.get_mapper(\n...     'reference://', fo='temp.json', target_protocol='file'\n... )\n>>> zarr.open(mapper, mode='r')\n<zarr.core.Array (1, 256, 256, 3) uint8 read-only>\n\nView the image in the JP2 file from the command line::\n\n    python -m imagecodecs _test.jp2\n",
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    "summary": "Image transformation, compression, and decompression codecs",
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