CHANGELOG.md

All notable changes to this project will be documented in this file.

[0.x.x - 2024-0x-xx]

Fixed

• Processing of the images in P mode with transparency = 0. #238

[0.16.0 - 2024-04-02]

This release contains breaking change for monochrome images.

Added

• Monochrome images without alpha channel, will be opened in L or I;16 mode instead of RGB. #215

Changed

• convert_hdr_to_8bit value now ignores monochrome images. #215
• subsampling parameter for encoding has higher priority than chroma. #213
• Minimum required libehif version is 1.17.0. #214
• Minimum supported Pillow version raised to 9.5.0. #216

[0.15.0 - 2024-02-03]

Added

• libheif_info function: added encoders and decoders keys to the result, for future libheif plugins support. #189
• options.PREFERRED_ENCODER - to use encoder different from the default one. #192
• options.PREFERRED_DECODER - to use decoder different from the default one. #193

Changed

• libde265 updated from 1.0.14 to 1.0.15. changelog
• libheif updated from 1.17.5 to 1.17.6. changelog

[0.14.0 - 2023-12-02]

Added

• Synonym for chroma encoder parameter: subsampling(usage is the same as in Pillow JPEG). #161 #165
• Passing image_orientation value to libheif, instead of manually rotating image according to EXIF before encoding. #168
• Pillow plugin: support for images in YCbCr mode for saving without converting to RGB. #169
• Pi-Heif: Python3.12 32-bit armv7 wheels. #160

Changed

• Increased the minimum required libheif version to 1.14.1.
• Linux: When building from source, libheif and other libraries are no longer try built automatically. #158
• Libheif updated from 1.16.2 to 1.17.5 version. #166 #175
• NCLX color profile - was reworked, updated docs, see PR for more info. #171
• Minimum supported Pillow version raised to 9.2.0.
• Pi-Heif: As last libheif version requires minimum cmake>=3.16.3 dropped Debian 10 armv7 wheels. #160
• libde265 updated from 1.0.12 to 1.0.14. changelog

Fixed

• Support of libheif 1.17.x. #156
• Windows : Build from source with MinGW Python. #178

[0.13.1 - 2023-10-15]

Added

• Returned PyPy 3.8 wheels.

Changed

• Linux: libaom updated to 3.6.1, musllinux builds switched to musllinux_1_2 tag.

Fixed

• When building from source, the installer additionally searches for libheif using pkg-config. #128

[0.13.0 - 2023-08-09]

Added

• Python 3.12, PyPy 3.10 wheels.
• Depth Image read support, they are available as a list in im.info["depth_images"] #116
• options.SAVE_NCLX_PROFILE - default False to be full compatible with previous versions, but in next versions may be changed to True. #118 Thanks to @wiggin15
• Support for Pillow 10.1.0

Changed

• The license for the project itself has been changed to "BSD-3-Clause" since "Apache 2.0" is not compatible with the "x265" encoder. #111 Thanks to @mattip
• Minimum required Pillow version increased from 8.4.0 to 9.1.1
• Dropped Python 3.7 support, PyPy 3.8 wheels.
• Dropped 32-bit wheels for Pillow-Heif. Pi-Heif still have 32-bit wheels.

[0.12.0 - 2023-07-08]

This release is fully compatible with previous versions.

Added

• (Heif) restored lost ability after 0.9.x versions to open HDR images in 10/12 bit. #96

Changed

• libde265(HEIF decoder) updated from 1.0.11 to 1.0.12 version. changelog
• libheif updated to 1.16.2.

Fixed

• Building from source when using apt-repository ppa:strukturag/libheif
• (Heif) encode function with stride argument correctly saves image.
• (Heif) HeifFile class created with from_bytes function with stride argument respect stride value during save.
• (Heif) HeifFile class created with from_bytes function with stride argument can correctly translate to the numpy array.

[0.11.1 - 2023-05-10]

This release is fully compatible with 0.10.x versions.

Fixed

• Revert EXIF changes from 0.11.0 - raw data again can begin with Exif\x00\x00. Thanks to @fabbaum #93
• (Heif) deepcopy support for HeifFile class.

[0.11.0 - 2023-04-30]

Changed

• EXIF raw data in info["exif"] is now skipping first 6 bytes(Exif\x00\x00). Like in Pillow for WEBP.

Fixed

• EXIF parsing(Xiaomi images and possible others). Thanks to @mxsleo #92
• (Pillow) deepcopy support for HeifImageFile and AvifImageFile
• (macOS, arm64) libde265(HEIF decoder) now has the same version as in other builds(1.0.8->1.0.11)
• (macOS, arm64) libaom(AVIF) now has the same version as in other builds(3.4.0->3.6.0)

[0.10.1 - 2023-04-03]

Added

• Windows PyPy wheels.
• Faster image loading implementation with Pillow 9.5.0
• options.ALLOW_INCORRECT_HEADERS option to allow loading files with invalid ispe header. Thanks to @Soooda #86

Changed

• libheif updated from 1.14.2 to 1.15.2

[0.10.0 - 2023-02-24]

Reworked version with the native C extension.

Added

• Restored ability to build from source with libheif==1.12.0
• Ability to encode images in LA mode

Changed

• libde265(HEIF decoder) updated from 1.0.9 to 1.0.11 version. changelog
• (Heif) convert_to method was removed, bgr_mode opt. parameter added to open_heif
• Many other changes, mostly for standalone usage. topic

Changed

• Fixed Access Violation(all versions were affected) when image size after decoding differs. #79

[0.9.3 - 2023-01-22]

Fixed

Two bugs in XMP metadata handling that were causing exceptions. All versions were affected. Thanks to @eeyrw for pointing out such a problem.

• Handling XMP data with zero byte at the end. #69
• Handling XMP data in latin1 encoding. #69

[0.9.2 - 2023-01-18]

Changed

• libheif updated from 1.14.0 to 1.14.2

[0.9.1 - 2023-01-02]

Changed

• info["nclx_profile"] changed the type from bytes(format of which was not described) to dict.
• Drop support for Python 3.6, PyPy 3.7. Added PyPy 3.9 wheels.
• convert_to method: RGBa to RGB mode support was removed(last Pillow supports it). #67

Fixed

• Small memory leak when opening image with nclx color profile. #64

[0.9.0 - 2022-12-15]

Changed

• Minimum supported version of libheif to build from source is 1.13.0
• Minimum required Pillow version increased from 6.2.0 to 8.3.0, getxmp is used from Pillow now. #55
• options() was reworked. Added new DECODE_THREADS option. #57

Fixed

• Added ability to save method to accept exif as PIL.Image.Exif class. #51
• Linux, Windows: fixed disabled multithreading for image decode. Added tests for this. Thanks to @jtressle #53
• Linux: building from source has been reworked to no longer require autoconf, automake and pkg-config.

[0.8.0 - 2022-11-20]

Added

• Armv7: wheels for Alpine 3.14+ with musllinux_1_2_armv7l tag.

Changed

• libheif updated to 1.14.0 version
• Ability to pass enc_params for save as List[Tuple[str, str]] was removed, now it accepts only Dict.
• Deprecated options().ctx_in_memory was removed(default behaviour does not change).
• Deprecated options().strict was removed(default behaviour does not change).
• Deprecated check, open, read, check_heif functions was removed.
• scale method marked as deprecated. Will be removed in 0.9.0 version.

Fixed

• Values in enc_params for save can now be of type int or float and will be automatically converted to str.
• Armv7: wheels supports Debian 10(was only Debian 11+\Ubuntu 20.04+ previously) with manylinux_2_28_armv7l tag.
• Armv7: wheels sizes decreased significantly(almost in 3x).

[0.7.2 - 2022-10-31]

Fixed

• (HeifImagePlugin) register proper mimetype for HEIF format. #47
• (HeifImagePlugin) decode image even when EXIF data is corrupted. #48
• (HeifImagePlugin) correct processing of EXIF that do not start with b'EXIF' (Pillow 9.3.0). #46

[0.7.1 - 2022-10-28]

Added

• Support for images with a premultiplied alpha channel (Pillow does not fully support these).
• (Heif) premultiplied_alpha read-write property.
• (Heif) to_pillow method to HeifFile class.
• (Heif) RGBA;16 -> RGBA conversion.
• (Heif) RGBa -> RGB conversion.

Changed

• libaom updated from 3.4.0 to 3.5.0 version. changelog
• libde265 updated from 1.0.8 to 1.0.9.
• (Heif) The get_file_mimetype function has been reworked and is now written in python.
• (Heif) The is_supported function has been reworked and is now written in python.
• options().strict option marked as deprecated and will be removed in 0.8.0.
• (Heif) check_heiffunction marked as deprecated.

Fixed

• (Heif) convert_to should do nothing if the target mode is already the current image mode.
• (AvifImagePlugin) do not register or accept .avifs files, libheif does not support them.
• Images in CMYK mode will be converted for RGBA mode during saving instead of throwing KeyError exception.

[0.7.0 - 2022-09-11]

This release is fully compatible with previous versions.

Changed

• libheif updated to version 1.13.0
• License for project itself changed to Apache 2.0

[0.6.1 - 2022-08-21]

This release contains security and bug fixes.

Changed

• Speed boost for AVIF encoding(+50%). commit

Fixed

• (Linux, Windows) libde265: CVE-2022-1253, CVE-2021-36408, CVE-2021-36410, CVE-2021-35452, CVE-2021-36411 MSYS2 PR
• libheif: with chroma=420(which is a default mode) encoded images are closer to the originals with arrived patches. libheif issue
• libheif: scaling of images in some cases: commit
• Total 21 patches with fixes from official libheif repo has arrived.

[0.6.0 - 2022-08-06]

This release is fully compatible with previous versions if was not using AVIF decoding before.

Added

• (Heif) save method accepts optional parameter format. If format="AVIF" output file will be encoded in h264 format using AOM.
• AvifImagePlugin introduced. Usage: register_avif_opener() or import pillow_heif.AvifImagePlugin
• After registering AvifImagePlugin you can work with .avif files the same way you do with .heic

Changed

• (HeifImagePlugin) By default not accepts .avif files, register AvifImagePlugin if you need that. If you use pillow_avif then do not =)
• options().hevc_enc property was removed.
• options().avif property was removed.

Fixed

• Better compatibility with pillow_avif package.
• (Linux) Wheels size decreased significantly(almost in 2x).
• (Linux) Building from source is a bit simpler, you can build it with your custom libraries from now.
• (Linux) Great speed boost for encoding with new build type(it is as fast now as in Windows builds).

[0.5.1 - 2022-07-30]

This release is fully compatible with 0.5.0 version.

Added

• chroma=4xx optional subsampling parameter for save. Equivalent to enc_params=[("chroma", "4xx")] in old versions.

Changed

• enc_params for save changed type from List[Tuple[str, str]] to Dict. Old code will still work, but marked as deprecated.
• libheif_info now returns also bundled versions of x265 and aom.
• options().avif marked as deprecated. Starting from 0.6.0 version to register an AVIF plugin there will be a separate function, and it will be disabled by default.
• options().hevc_enc marked as deprecated and will be removed in 0.6.0.

Fixed

• Rare situation when exif orientation is 1 and xmp orientation different from 1 present at same time.
• XMP tags orientation that is generated by exiftool in some cases.
• Updated libaom on Linux and Windows from 3.3.0 to 3.4.0 version. MacOS builds had already that version in 0.5.0.
• Pillow plugin now does not register save methods for HEIF format if build does not contain HEIF encoder(for custom build from source).
• Slight speed optimizations for working in a Pillow plugin mode.

[0.5.0 - 2022-07-21]

Thumbnails were reworked, if was not use them before, then this release is fully compatible with 0.4.0 version. It is a final API release, no more further changes to existing API are planned, only bugfixes, etc.

Added

• (Heif, HeifImagePlugin) thumbnail function, docs for it.
• __numpy_array__ property to HeifFile
• convert_to method to HeifFile

Changed

• Wheels now are in ABI3 format for CPython(cp3x-abi3-xxx.whl), 3x less size on PyPi.
• (Heif) to_pillow method, now fills metadata from an original image if was called for thumbnails.
• (HeifImagePlugin) During open current frame in multi frame images are set to index of Primary Image.
• (Heif) add_thumbnails method moved from HeifFile/HeifImage to separate file and now can accept a PIL Image.

Fixed

• (HeifImagePlugin) Nice speed up for reading images having thumbnails in a Pillow plugin mode.
• (HeifImagePlugin) XMP metadata save from TIFF and JPEG.
• (HeifImagePlugin) EXIF metadata save from TIFF(only for Pillow >= 9.2).
• (HeifImagePlugin) Not to change the index of a current frame during saving multi-frame images.

[0.4.0 - 2022-07-04]

Added

• (Heif) - Numpy array interface support.
• (Heif) - add_from_bytes method and from_bytes function added. Allows to read 16-bit color images with OpenCV(or any other library) and save it as 10(12) bit HEIF.
• (Heif) - convert_to method to HeifImage to provide an easy way to open 10 or 12 bit images as 16 bit for OpenCV(or any other library)
• (Heif, HeifImagePlugin) - support for saving images from I, I;16, BGRA;16, BGR;16, BGRA, BGR modes.
• (Heif) - added save_to_12bit to options, default False. Determines what bitness will have converted 16-bit images during saving.

Changed

• IMPORTANT!!! 10/12 bit images changed their byte order from Big Endian to Little Endian. Probably no one still uses that API, but who knows...
• (Heif) - HeifFile.chroma and HeifFile.color properties was removed(they were not documented so probably no one will notice this), that info now stored in mode.
• (Heif, HeifImagePlugin) - mode for 10/12 bits was changed and accepts wider range of values, look here
• Docs were updated & rewritten to reflect all those changes.

Fixed

• Examples were fixed & rewritten(were broken from 0.3.1+ versions).
• exif loading in HEIF sequence for Pillow 9.2+ (python-pillow/Pillow#6335)

[0.3.2 - 2022-06-25]

Fixed

• Support of saving images with mode="1" in "L" mode.
• Images with mode="L" are now saved natively in Monochrome mode(increase speed & decreased required memory and a bit less size)
• Speed optimization for save append_images parameter
• Possible SEGFAULT during encoding with some stride values.

[0.3.1 - 2022-06-17]

Added

• (Heif) - HeifFile gets images: List[HeifImage] and alternative method of changing order of images by editing it.
• (HeifImagePlugin) - info image dictionary can be now edited in place, and it will be saved for image sequences.

Changed

• Updated docs.

Fixed

• (HeifImagePlugin) Again fixing image order, for Pillow plugin it was not fixed fully in 0.3.0.
• Optimizing code.

[0.3.0 - 2022-06-11]

Added

• (HeifImagePlugin, Heif) - save now recognizes exif= and xmp= optional parameters. Works as in other Pillow plugins. #25
• (HeifImagePlugin, Heif) - save now recognizes primary_index optional parameter.
• (HeifImagePlugin, Heif) - info["primary"] value.
• (Heif) - primary_index method to HeifFile class.
• Docs: Encoding
• Docs: Changes in Order Of Images

Changed

• Changed image order when multiply images present, HeifFile points to primary image as it was before, but it can be not the first image in a list.
• When using as a Pillow's plugin the only way to know is an image Primary or not is to perform check of info["primary"] value.
• (Heif) - optimized code of HeifImageThumbnail, added get_original method.

Fixed

• (HeifImagePlugin) - save bug, when first frame was saved instead of current.
• Minor usage fixes and optimizations.

[0.2.5 - 2022-05-30]

Added

• (HeifImagePlugin) - support for PIL.ImageFile.LOAD_TRUNCATED_IMAGES flag.
• (Windows, encoder) - encoding of 10 and 12 bit images. #24

Changed

• (Windows) - replaced vcpkg build by MSYS2(MinGW) build, report of any possible bugs you see.

[0.2.4 - 2022-05-18]

Added

• (HeifImagePlugin) - saving of XMP tags from PNG.
• Benchmarks page to docs.

Changed

• Added option ctx_in_memory, default=True. Benchmarks showed that versions 0.1.x which worked like that, was much faster. This will not affect any user code, changes are internal.

Fixed

• (HeifImagePlugin) - XMP Orientation tag.
• (HeifImagePlugin, encoder) L and LA color modes. #23 (@Jarikf)

[0.2.3 - 2022-05-02]

Added

• Documentation has arrived.
• (HeifImagePlugin) - custom_mimetype field added like in other Pillow's plugins, instead of info["brand"]
• (Heif) - mimetype field added to HeifFile class, instead of info["brand"]

Changed

• (Heif) - apply_transformations parameter in function open_heif was removed.
• (HeifImagePlugin, Heif) - removed brand and main values from info dictionary.
• (Heif) - added original_bit_depth property. It will not break any existing code. See docs.
• (Heif) - function reset_orientation was renamed to set_orientation.

Fixed

• (HeifImagePlugin, Heif) - fix exif rotation, when converting from non heif to heif. See in docs chapter: Workarounds
• (HeifImagePlugin, Heif) - allow saving empty HeifFile when append_images parameter present.
• (HeifImagePlugin, Heif) - during saving, fp will be open after encoding process finished, and not before start.
• (Heif) - HeifImage.chroma and HeifImage.color property now available before the image load, right after open.

[0.2.2 - 2022-04-23]

Added

• PyPy 3.9 wheels.
• (HeifImagePlugin, Heif) append_images parameter to save methods.
• (HeifImagePlugin) - import pillow_heif.HeifImagePlugin for automatic Pillow plugin registration(as alternative to calling register_heif_opener).
• (HeifImagePlugin, Heif) quality can be now -1 which indicates a lossless encoding.
• (HeifImagePlugin) - getxmp method. Works the same way as in Pillow's PngImagePlugin | JpegImagePlugin.
• (Heif) - added raw xml as info["xml"] and public function pillow_heif.getxmp(the same as for HeifImagePlugin)

Fixed

• (HeifImagePlugin, Heif) - Memory Leak when Opening images, that appear in version 0.2.0 was Slain Like a Hydra (C)
• (HeifImagePlugin) - closing exclusive fp, this bug was only in 0.2.0+ versions.
• (HeifImagePlugin, Heif) - rare Python crash, with specific strides of thumbnails. More tests for that.
• (HeifImagePlugin, Heif) - Python crash when HeifFile closes its HeifImages when they are still referenced.

[0.2.1 - 2022-04-17]

Added

• (Windows) Build script by default assumes that libheif installed in C:\vcpkg\installed\x64-windows, if VCPKG_PREFIX environment is missing.
• (Heif) reader_add_thumbnail and reader_remove_image examples.
• (Heif) to_pillow method and adjusted examples to use it.

Changed

• (Heif) Removed HeifSaveMask, get_img_thumb_mask_for_save that was previously introduced, instead added __delitem__ to HeifFile.
• Thumbnail encoding features reworked to simplify api. See add_thumbnails methods in HeifFile and HeifImage classes.

Fixed

• (HeifImagePlugin) Fixed palette images with bytes transparency conversion. #21 (@Jarikf)
• (Heif) Raises ValueError when trying to save empty(no images) file.
• (HeifImagePlugin) Skips images with sizes = 0 during save, if there are no images, raise ValueError.
• (HeifImagePlugin) Memory optimizations, when there is only one image in file.
• Added licenses for libraries in binary wheels.
• (Windows) Fix docs for building and developing.
• (Heif) add_from_pillow method, now adds thumbnails from Pillow if it is HeifImageFile(ImageFile.ImageFile) class.

[0.2.0 - 2022-04-09]

Added

• encoding of images and thumbnails.
• save and save_all methods for Pillow plugin.
• save method for HeifFile class.
• from_pillow method, to init HeifFile class from Pillow.
• add_heif method for HeifFile class, to concatenate two heic files.
• more examples.

Changed

• read_heif in process of deprecation. When you read data or stride properties image will be loaded automatically.
• Undecoded* classes was removed.
• Input files are now not read to memory, they will be read them from fp object only when need something. You can use old load and close(fp_only=true) to read it form fp and close it.
• thumbnails are enabled by default.
• many other minor changes.
• in future there will be fewer changes to api, this project goes to stable version from now.

Fixed

• Speed and memory optimisations.

[0.1.11 - 2022-03-24]

Added

• Linux aarch64 PyPy 3.7 & 3.8 wheels.
• wrapper for libheif function get_file_mimetype.
• burst(container) image support(ImageSequence) for heic and hif when using as a pillow plugin.
• convert to jpg example for both reader and plugin use.
• in addition to iterator, to loop throw all images, (Undecoded)``HeifFile class now support access images by index.

Changed

• heif_brand_* constants was removed, as mentioned in changes for 0.1.9 version.

Fixed

• memory leak when working with thumbnails, now properly releases the thumbnail handle.
• rare bug with garbage collector for PyPy.
• as_opener register image/heic mimetype in addition to image/heif.
• as_opener also registers .heif extension, thanks @dust-to-dust for pointing that.
• as_opener sets orientation tag to 1 from Exif to not rotate image twice(libheif already do transforms)
• for reader you can do that manually if needed, with new reset_orientation function.

[0.1.10 - 2022-03-17]

Added

• macOS Intel PyPy3.7 & PyPy3.8 v7.3 wheels.
• class HeifCompressionFormat(IntEnum). have_decoder_for_format and have_encoder_for_format functions.
• function libheif_info that returns dictionary with the version and available (en)(de)coders.
• class HeifThumbnail for thumbnails, see in examples. Only for reader now, the next version will be for Pillow plugin as well.
• top lvl images support(burst), see in examples. Only for reader now, the next version will be for Pillow plugin as well.
• method thumbnails_all returning an iterator for getting thumbnails in all images in HeifFile.

Changed

• OPTIONS["avif"] and OPTIONS["strict"] replaced with options function, that returns PyLibHeifOptions class with those properties.
• if available, functions to check if image is supported HEIF will try to get 16 bytes instead of 12.

[0.1.9 - 2022-03-10]

Added

• Linux PyPy 3.7 & 3.8 wheels.
• IMPORTANT! heif_filetype_* constants will be deprecated in the future. Use class HeifFiletype(IntEnum).
• IMPORTANT! heif_brand_* constants will be deprecated in the future. Use class HeifBrand(IntEnum).
• Added cfg_options function, to change config when used not as opener. Look at _options.py for more info.
• OPTIONS: strict and avif - look at reader.is_supported function description.
• class HeifErrorCode(IntEnum) to use in custom exception handler.
• class HeifColorspace(IntEnum) instead of heif_colorspace_* constants.
• class HeifChannel(IntEnum) instead of heif_channel_* constants.
• class HeifChroma(IntEnum) instead of heif_chroma_* constants.
• A few examples of how to use.

Changed

• register_heif_opener optionally accepts **kwargs as parameter, for overwriting values in config, when used as opener.
• check_heif_magic marked as deprecated. Use is_supported function instead.
• check_heif always return HeifFiletype.NO when there are less 12 bytes in input.
• Warning(Unssuported HEIF... trying anyway) was removed.
• (Undecoded)HeifFile and HeifImageFile classes was slightly changed(more consistent now). See the new description in README.md.
• Many other improvements and optimizations.
• When used as reader, functions open_heif and read_heif raise HeifError exception if file is not valid or broken.

Fixed

• If color_profile is prof or rICC and data empty, color_profile will contain data=None instead of color_profile=None.
• check_heif, is_supported, open_heif and read_heif now preserves the file pointer, if input was a file handle.

[0.1.8 - 2022-03-05]

Added

• Ability to build from source on alpine with arm 7. Thanks to @aptalca

Changed

• HeifFile close method now frees image decoded data.
• Code optimization.

[0.1.7 - 2022-02-27]

Added

• Added manylinux2014_i686 wheels.
• Integration of PEP 517 in progress, added new instructions for building from source.

Changed

• Making code cleaner, renamed cffi module from pillow_heif.libheif to _pillow_heif_cffi.
• libaom bumped from 3.2.0 to 3.3.0

Fixed

• Fixed AttributeError when calling Image.verify. Thanks @zijian-hu for reporting.

[0.1.6 - 2022-02-10]

Added

• Windows binary wheels.
• More tests to as_opener module.
• Code coverage.

Changed

• Using code formatting: black.
• Started changing build algorithms to support PEP 517.
• Speed optimizations and adjustments to as_opener module.
• Added info[icc_profile] to HeifImageFile when use it as as_opener.
• Adjustments to reader module:
• pillow_heif.open is in process of deprecation, still available, but you should use open_heif instead.
• pillow_heif.check is in process of deprecation, still available, but you should use check_heif instead.
• pillow_heif.read is in process of deprecation, still available, but you should use read_heif instead.

Fixed

• Apple M1 binary wheels now build on Monterey 12.01 instead of 12.2.
• HeifError exception class now calls super to init all values.

[0.1.5 - 2022-02-01]

Added

• Apple M1 binary wheels.
• Alpine Linux binary wheels.
• More auto tests before publishing.

Changed

• libaom bumped from 2.0.0 to 3.2.0

[0.1.4 - 2021-11-05]

First normal working release.

Added

• Python 3.10 wheels.
• Added libaom library to linux build.
• More tests.

Changed

• Code refactoring, readme update.

Fixed

• Bug with header check when used as plugin for Pillow with as_opener function. Thanks for this to @DimonLavron