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KelSolaar

PR: Implement support for "Hellwig, Stolitzka and Fairchild (2022)" "Helmholtz–Kohlrausch" effect extension.

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# Summary This PR implements support for *Hellwig, Stolitzka and Fairchild (2022)* *Helmholtz–Kohlrausch* effect extension for the following Colour Appearance Models (CAM): - *CIECAM02* - *CAM16* - *Hellwig and Fairchild...

KelSolaar

# Summary k is passed by position in several functions, so the order of arguments matters. Bug fix. in discrete integration, you also need to multiply by ∆λ adds unit...

tjdcs

[pre-commit.ci] pre-commit autoupdate

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updates: - [github.com/pre-commit/pre-commit-hooks: v4.5.0 → v5.0.0](https://github.com/pre-commit/pre-commit-hooks/compare/v4.5.0...v5.0.0) - [github.com/codespell-project/codespell: v2.2.6 → v2.3.0](https://github.com/codespell-project/codespell/compare/v2.2.6...v2.3.0) - [github.com/astral-sh/ruff-pre-commit: v0.1.14 → v0.6.9](https://github.com/astral-sh/ruff-pre-commit/compare/v0.1.14...v0.6.9) - [github.com/adamchainz/blacken-docs: 1.16.0 → 1.19.0](https://github.com/adamchainz/blacken-docs/compare/1.16.0...1.19.0) - [github.com/pre-commit/mirrors-prettier: v3.1.0 → v4.0.0-alpha.8](https://github.com/pre-commit/mirrors-prettier/compare/v3.1.0...v4.0.0-alpha.8)

pre-commit-ci[bot]

[FEATURE]: Implement support for Python Array API Standard.

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### Description [JAX](https://github.com/google/jax) includes a numpy compatible `jax.numpy` module which has a bunch of nice features (automatic differentiation, jit compilation, vectorized mapping, GPU runtime, js export). They've taken great pains...

imh

[FEATURE]: Implement smooth D and ID illuminants in CIE 204:2013 "Methods for Re-defining CIE D Illuminants"

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### Description CIE 204:2013 "Methods for Re-defining CIE D Illuminants" (https://cie.co.at/publications/methods-re-defining-cie-d-illuminants) defines a number of "highly smoothed" versions of the D and ID illuminants. They are referenced in https://www.oscars.org/sites/oscars/files/ssi_overview_2020-09-16.pdf. PS....

Artoria2e5

Helper functions for arithmetic on MSDS

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In a previous discussion the need for getting the sum of an MSDS object came up. I've needed to do this twice recently. Once where I needed the sum of...

tjdcs

[FEATURE]: Add "Oklch" colourspace.

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### Description Oklab and Oklch has been added to [CSS Color Module Level 4](https://www.w3.org/TR/css-color-4/#ok-lab). But, only Oklab is available for Colour. Adding Oklch will be great for convenience.

dofuuz

### Description # References - [Simple color appearance model (sCAM) based on simple uniform color space (sUCS)](https://opg.optica.org/oe/fulltext.cfm?uri=oe-32-3-3100)

KelSolaar

Add is_within_visible_xy implementation

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Add an xy implementation to is_within_visible_spectrum for brightness invariant checking.

tjdcs