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Notable Changes in OpenSlide Python

Version 1.4.3, 2025-12-03

New features

Changes

Version 1.4.2, 2025-04-28

Changes

  • Drop support for Python 3.8
  • Switch to PEP 639 project license metadata
  • examples: Update OpenSeadragon to 5.0.1
  • examples: Add license files for bundled JavaScript
  • tests: Add PEP 735 dependency group for test dependencies

Version 1.4.1, 2024-10-30

Bug fixes

  • Fix setup.py install with old setuptools (1.4.0 regression)
  • examples: Fix deepzoom_tile.py -r with Jinja < 2.11.0 (1.4.0 regression)

Version 1.4.0, 2024-10-29

New features

  • Support OpenSlide installed from PyPI with pip install openslide-bin
  • Add type hints for Python ≥ 3.10
  • Add wheels for Linux aarch64, Linux x86_64, and macOS arm64 + x86_64
  • Build version-independent wheels on Python ≥ 3.11
  • examples: Default deepzoom_tile.py job count to available CPUs when known

Changes

  • Drop wheel for 32-bit Windows
  • Rename source distribution to openslide_python per PEP 625
  • Require AbstractSlide subclasses to implement all abstract methods
  • Provide default AbstractSlide.set_cache() implementation
  • Switch to PEP 621 project metadata
  • docs: Document existence of AbstractSlide
  • examples: Update OpenSeadragon to 5.0.0

Bug fixes

  • If OpenSlide cannot be loaded, report errors from all attempts
  • Fix OpenSlide support for bytes filename arguments (1.2.0 regression)
  • Disallow arbitrary types as OpenSlide filename arguments (1.2.0 regression)
  • Encode OpenSlide filename arguments using Python filesystem encoding
  • Add error check to OpenSlide.set_cache()
  • docs: Fix types of properties that return tuples of items

Version 1.3.1, 2023-10-08

  • docs: Document using ICC profile's default intent, not absolute colorimetric
  • examples: Default to ICC profile's default intent, not absolute colorimetric
  • tests: Correctly require pytest ≥ 7.0

Version 1.3.0, 2023-07-22

  • Support new soname in OpenSlide ≥ 4.0.0
  • Drop support for Python 3.7
  • Expose color management profiles where available
  • Notate available OpenSlide functions in low-level API
  • docs: Update OpenSlide 3.5.0 references to 4.0.0
  • docs: Consolidate license information
  • docs: Drop support for building with Sphinx < 1.6
  • examples: Fix startup failure with Flask ≥ 2.3.0
  • examples: Transform to sRGB (with absolute colorimetric intent) by default
  • examples: Update OpenSeadragon to 4.1.0
  • examples: Correctly import openslide on Windows if OPENSLIDE_PATH not set
  • tests: Fix pytest of installed package from source directory

Version 1.2.0, 2022-06-17

  • Drop support for Python < 3.7
  • Support cache customization with OpenSlide 3.5.0
  • Improve pixel read performance
  • Clarify exception raised on Windows or macOS when OpenSlide can't be found
  • Raise OpenSlideVersionError when an operation requires a newer OpenSlide
  • Support pathlib.Path in filename arguments
  • Fix Pillow Image.ANTIALIAS deprecation warning
  • docs: Add detailed installation instructions
  • docs: Convert README and CHANGELOG to Markdown
  • examples: Share cache among all multiserver slides, if supported
  • examples: Fix deepzoom_tile.py --viewer with Jinja 3.x
  • examples: Read OpenSlide DLL path from OPENSLIDE_PATH env var on Windows
  • examples: Update OpenSeadragon to 3.0.0

Version 1.1.2, 2020-09-13

  • Fix install with setuptools ≥ 46
  • Fix ImportError with Python 3.9
  • Fix docs build with Sphinx 2.x
  • Remove --without-performance install option

Version 1.1.1, 2016-06-11

  • Change default Deep Zoom tile size to 254 pixels
  • Fix image reading with Pillow 3.x when installed --without-performance
  • Fix reading ≥ 229 pixels per call --without-performance
  • Fix some unclosed file ResourceWarnings on Python 3
  • Improve object reprs
  • Add test suite
  • examples: Drop support for Internet Explorer < 9

Version 1.1.0, 2015-04-20

  • Improve pixel read performance using optional extension module
  • examples: Add scale bar via OpenSeadragonScalebar plugin
  • examples: Update OpenSeadragon to 1.2.1
  • examples: Enable rotation buttons in multiserver
  • examples: Verify at server startup that file was specified
  • examples: Disable pinch zoom outside of viewer

Version 1.0.1, 2014-03-09

  • Fix documentation build breakage

Version 1.0.0, 2014-03-09

  • Add documentation
  • Switch from distutils to setuptools
  • Declare Pillow dependency in setup.py (but still support PIL)

Version 0.5.1, 2014-01-26

  • Fix breakage on Python 2.6
  • examples: Fix tile server breakage on classic PIL

Version 0.5.0, 2014-01-25

  • Require OpenSlide 3.4.0
  • Support Python 3
  • Return Unicode strings on Python 2
  • Replace OpenSlide.can_open() with OpenSlide.detect_format()
  • Optionally generate Deep Zoom tiles only for the non-empty slide region
  • Fix Deep Zoom tile positioning bug affecting Aperio slides
  • Fix library loading with MacPorts
  • Propagate open errors from openslide.open_slide()
  • examples: Add multiple-slide Deep Zoom server
  • examples: Enable multithreading in tile servers
  • examples: Avoid loading smallest Deep Zoom levels
  • examples: Update OpenSeadragon to 1.0.0

Version 0.4.0, 2012-09-08

  • Require OpenSlide 3.3.0
  • Rename layer to level throughout API
  • Provide OpenSlide version in openslide.__library_version__
  • Properly report openslide_open() errors on OpenSlide 3.3.0
  • Fix library loading on Mac OS X

Version 0.3.0, 2011-12-16

  • Fix segfault if properties/associated images accessed after OpenSlide is closed
  • Add methods to get Deep Zoom tile coordinates and dimensions
  • Fix loading libopenslide on Windows
  • Fix for large JPEG tiles in example Deep Zoom tilers
  • Make example static tiler output self-contained

Version 0.2.0, 2011-09-02

  • Initial library release
  • Example static Deep Zoom tiler and web viewer applications