Color version 0.10.0

[0.10.0] — April 19th, 2026

Added

• Add Color.Rec2020 and Color.AppleRGB spaces and extend Color.Spectral with B, C, F2, F7, F11 illuminants and blackbody/1.

Color version 0.9.0

[0.9.0] — April 16th, 2026

Bug Fixes

• Add the seed as a URL param so the seed travels to each tab in the visualizer.

Color version 0.8.0

[0.8.0] — April 16th, 2026

Bug Fixes

• Smooth the tonal lightness gradient for the palette.

Color version 0.7.0

[0.7.0] — April 16th, 2026

Changed

• Generate Tailwind 4 classes, not Tailwind 3.

Color version 0.5.0

[0.5.0] — April 14th, 2026

Added

• Color.Palette module with three palette-generation algorithms for design systems and web sites.

• Color.Palette.Visualizer — a Plug-based web UI for previewing the three palette algorithms. Three views modelled on UI Colors (Tonal), Material Theme Builder (Theme), and Adobe Leonardo (Contrast).

Color version 0.4.0

Added

• Color.LED module with support for multi-channel addressable LED pixels that include extra white channels. Color.LED.RGBW covers four-channel pixels (R, G, B, W) used by WS2814 and SK6812-RGBW. Color.LED.RGBWW covers five-channel RGB+CCT pixels (R, G, B, WW, CW) used by WS2805 and several SK6812 variants. Both provide from_srgb/2, to_srgb/1, and to_xyz/1. Color.LED.chip_options/1 returns recommended extraction options for common chip variants (:ws2814_ww, :ws2814_nw, :ws2814_cw, :sk6812_ww, :sk6812_nw, :sk6812_cw, :ws2805).

• Color.ANSI module for parsing and emitting ANSI SGR colour escape sequences. Supports 16-colour, 256-colour indexed, and 24-bit truecolor forms, with perceptual nearest-palette matching (CIEDE2000) when encoding to the 16- or 256-colour palette. Includes parse/1, to_string/2, wrap/3, nearest_256/1, nearest_16/1, palette_256/0, palette_16/0, and a typed Color.ANSI.ParseError exception.

• Top-level Color.to_hex/1, Color.to_css/1,2, and Color.to_ansi/1,2 convenience functions that accept any input Color.new/1 accepts and raise a typed exception on failure.

Changed

• Changed the module Color.CSSNames to Color.CSS.Names

• Changed all colorspace module names to be the closest possible match to their standard names.

Color version 0.3.0

Added

• Twenty-one color-space struct modules covering CIE, modern perceptual, HDR, video, device, and web spaces: Color.SRGB, Color.AdobeRGB, Color.RGB (linear, in any of 24 named working spaces), Color.Lab, Color.LCHab, Color.Luv, Color.LCHuv, Color.XYZ, Color.XyY, Color.Oklab, Color.Oklch, Color.HSLuv, Color.HPLuv, Color.HSL, Color.HSV, Color.CMYK, Color.YCbCr, Color.JzAzBz, Color.ICtCp, Color.IPT, Color.CAM16UCS.

• Top-level Color.new/1,2, Color.convert/2,3,4, Color.convert_many/2,3,4, Color.luminance/1, Color.sort/2, Color.premultiply/1, Color.unpremultiply/1.

• Chromatic adaptation (Color.XYZ.adapt/3) with six methods: :bradford, :xyz_scaling, :von_kries, :sharp, :cmccat2000, :cat02. Color.XYZ.apply_bpc/3 for black point compensation.

• ICC rendering intents wired into Color.convert/3,4: :relative_colorimetric (default), :absolute_colorimetric, :perceptual, :saturation. Optional bpc: true and adaptation: method override.

• Color.ICC.Profile matrix-profile reader covering ICC v2/v4 RGB→XYZ profiles with curv LUT and para parametric (types 0–4) tone response curves; load/1, parse/1, to_xyz/2, from_xyz/2.

• Color difference metrics (Color.Distance): CIE76, CIE94, CIEDE2000 (verified against Sharma 2005), and CMC l:c.

• Contrast (Color.Contrast): WCAG 2.x relative luminance and contrast ratio, APCA W3 0.1.9, contrast-aware pick_contrasting/2.

• Color mixing and gradients (Color.Mix) with the default Oklab interpolation space and CSS Color 4 hue-interpolation modes.

• Gamut checking and mapping (Color.Gamut) with both :clip and the CSS Color 4 Oklch binary-search perceptual algorithm.

• Color harmonies (Color.Harmony) — complementary, analogous, triadic, tetradic, split-complementary — in any cylindrical space.

• Color temperature (Color.Temperature): McCamy CCT, Planckian and CIE daylight loci, xyz/2.

• CSS Color Module Level 4 / 5 parser and serialiser (Color.CSS): hex, named colors, all standard color functions, color() with display-p3 / a98-rgb / prophoto-rgb / rec2020 / xyz, device-cmyk(), color-mix(), relative color syntax, none, and calc() expressions.

• CSS named colors (Color.CSSNames): all 148 CSS Color Module Level 4 names plus chromagreen and chromablue. Atom and snake-case input. Reverse nearest/1 lookup via CIEDE2000.

• ~COLOR sigil (Color.Sigil) for compile-time color literals, compile-fenced behind Elixir 1.15.

• Spectral pipeline (Color.Spectral + Color.Spectral.Tables): CIE 1931 2° and CIE 1964 10° standard observer CMFs, D65 / D50 / A / E illuminant SPDs, emissive and reflective integration, metamerism index.

• All sixteen CSS Compositing Level 1 blend modes (Color.Blend).

• Transfer functions (Color.Conversion.Lindbloom): sRGB, gamma 2.2 / 1.8, L*, BT.709, BT.2020, PQ (SMPTE ST 2084), HLG, Adobe RGB γ.

• Typed exception modules under Color.*Error for every fallible function. Every error returns {:ok, _} or {:error, %SomeError{...}} with semantic fields.

• Public Color.Behaviour declaring the to_xyz/1 and from_xyz/1 contract that every color-space struct module satisfies.

• Color.is_color/1 and Color.is_css_name/1 compile-time guards plus Color.color?/1, Color.css_name?/1, and Color.validate_transparency/1 migration helpers.

• @type t on every public color-space struct module and @spec annotations across the public API.

• Benchee benchmark suite under bench/ covering single-color conversions, batch vs Enum.map, and the :persistent_term working-space cache.

• Property-based test suite (test/property_test.exs) covering round-trip identity, alpha preservation, hue wrap-around, gamut-mapping invariance, ΔE symmetry, mix endpoint identity, and WCAG contrast bounds across every supported space.

Performance

• Color.RGB.WorkingSpace.rgb_conversion_matrix/1 results are cached in :persistent_term so repeated lookups for the same named space are constant-time after the first call.