Colour 0.4.0 is available!

We are pleased to announce that after over a year of work, Colour 0.4.0 has been released!

This release integrates most of the GSoC 2021 work from Cédric (@villirion), all the code from Geetansh (@SGeetansh) and the remaining GSoC 2020 code from Nishant (@SGeetansh). We would like to thank them again for their excellent contributions!

We are finally dropping Python 2.7 support and the minimal version is now Python 3.8 as per https://scientific-python.org/.

The following minimal dependency versions are also required:

• imageio >= 2, < 3

• numpy >= 1.19, < 2

• scipy >= 1.5, < 2

• typing-extensions >= 4, < 5

The highlights of this release are as follows:

• Colour can on iOS and iPadOS with Pyto.

• The import of colour is now 3.6 times faster.

• Typing annotations have been added and the codebase is checked with Mypy.

• The documentation has been updated and uses the pydata-sphinx-theme and has better compliance with PEP257.

• The code formatter is now Black.

• Many Python 3 features such as f-Strings or the dataclass decorator have been adopted.

• The plotting API has been improved to be more consistent when setting the colours of some figures, e.g., spectral or planckian locus.

• New colour appearance models:

  • Zhai and Luo (2018) chromatic adaptation model.

  • Kim, Weyrich and Kautz (2009) colour appearance model.

  • ZCAM colour appearance model.

  • Helmholtz-Kohlrausch effect estimation.

• New colour models:

  • Oklab colour model.

  • Hanbury (2003) IHLS (Improved HLS) colourspace.

  • DIN99b, DIN99c, and DIN99d refined formulas.

  • ProLab colourspace.

  • Sarifuddin and Missaoui (2005) HCL colourspace.

• New RGB colourspaces and transfer functions:

  • Nikon N-Gamut colourspace and the N-Log log encoding.

  • Blackmagic Wide Gamut colourspace and the associated Blackmagic Film Generation 5 OETF.

  • DaVinci Intermediate OETF.

  • RED Log3G10 encoding and decoding curves with linear extension.

• Other notable features:

  • R’G’B’ to Y’CbCr matrices computation.

  • Gamut ring/section plotting.

  • Rösch-MacAdam colour solid hue lines.

  • Huang et al. (2015) power-functions.

  • LUT 1D, LUT 3x1D and LUT 3D inversion.

  • UPRTek and Sekonic spectral data parsers.

  • SPImtx LUT input and output.

  • Support for the OpenColorIO processor.

  • Note that the optional dependency is not specified in the pyproject.toml, see AcademySoftwareFoundation/OpenColorIO#1573 for more information.

Thanks again to all the contributors to this release!

• @aforsythe

• @fredsavoir

• @ilia3101

• @jedypod

• @JGoldstone

• @Nick-Shaw

• @njwardhan

• @Paul-Sims

• @ramparvathaneni

• @romanovar

• @Saransh

• @SGeetansh

• @sobotka

• @villirion

• @zachlewis

Please take a look at the releases page more information.