Provides tools for parsing CSS color strings (e.g., hex, oklch, rebeccapurple) and converting colors to modern CSS formats.
Generates .cube LUT files compatible with FFmpeg for color space conversions and camera log transforms.
Generates HLSL shader code for color space conversions that can be used in Unity.
Open collection of color spaces.
Verified formulas
Conventional ranges
JS / WASM / GLSL / LUT / ICC
import space from 'color-space';
space.rgb.oklch(255, 128, 0); // → [0.732, 0.186, 53] — modern CSS
space.slog3.rec2020(0.5, 0.5, 0.5); // camera log → UHD wide gamut
space.rgb.xyz(300, -10, 0); // → [59.7, 30.6, 2.8] — out-of-range in, unclamped out
// batch
space.rgb.oklch([255, 128, 0, 0, 255, 128]); // [0.732, 0.186, 53, 0.875, 0.234, 151]
// meta
space.lab.range; // [[0, 100], [-125, 125], [-125, 125]]Individual spaces:
import oklch from 'color-space/oklch.js';
oklch.rgb(0.65, 0.25, 180); // matches CSS oklch(0.65 0.25 180)Related MCP server: MCP Color Converter
color-space – All 205 interconnected spaces · 55 kB gzip
color-space/<name>.js – One standalone space
color-space/lite – 54-space working set · 29 kB gzip
color-space/wasm – lite set as WASM · bare .wasm included
color-space/gl – GLSL/WGSL shader source
color-space/gl/hlsl · color-space/gl/msl – HLSL (DirectX, Unity, Unreal) and Metal, written by naga from the WGSL · await hlsl('rgb', 'oklch') · needs the optional peer naga-wasm (it declares Node ≥ 24.12; CI runs it on 22, where npm only warns)
color-space/lut – .cube LUTs for Resolve, Premiere, OBS, ffmpeg — verified vs ACES
color-space/icc – Matrix + TRC or CLUT profiles
color-space/data.json – Channels, ranges, provenance, references, graph, gamuts
npx color-space rgb oklch 255 128 0 – CLI, no install: convert (default) · cube · icc · space · spaces · mcp (MCP server for agents)
MCP tools – convert · gamut · css · space · spaces · cube · shader · icc · code – so agents call verified math instead of guessing it. A color goes in as any CSS string ('#ff8000', 'oklch(0.7 0.1 50)', 'rebeccapurple') or as channel values; shader writes the conversion as GLSL, WGSL, HLSL or MSL, code gives the JS call and its verified colour-science equivalent.
claude mcp add color-space -- npx -y color-space mcp # Claude Code
code --add-mcp '{"name":"color-space","command":"npx","args":["-y","color-space","mcp"]}' # VS CodeClaude Desktop claude_desktop_config.json, any project .mcp.json:
{ "mcpServers": { "color-space": { "command": "npx", "args": ["-y", "color-space", "mcp"] } } }Claude Code plugin (the server plus a skill): /plugin marketplace add colorjs/color-space, then /plugin install color-space@color-space. Docker: docker build -t color-space-mcp . and run it with docker run -i --rm color-space-mcp.
Over HTTP (Streamable HTTP, stateless): npx -y color-space mcp --http 8787 on localhost, or host fetch from color-space/mcp.js in a Worker, Deno or Bun. Skill for agents that load skills: plugins/claude/skills/color-space.
Display & web sRGB · Display P3 · Rec. 2020 · Linear-light sRGB · Rec. 709 · ProPhoto RGB · Adobe RGB (1998) · DCI-P3 · Linear Display P3 · Linear Rec. 2020 · Linear Adobe RGB (1998) · Linear ProPhoto RGB · scRGB · RIMM RGB · CIE RGB · NTSC RGB (1953) · PAL / SECAM RGB · Apple RGB · SMPTE-240M · ECI RGB v2 · Adobe Wide Gamut RGB · ColorMatch RGB · Bruce RGB · Beta RGB · Best RGB · Don RGB 4 · Ekta Space PS 5 · Russell RGB
RGB remixes HSL · HSV / HSB · HWB · HSI · IHLS · HCG · HCL · HSP · HCY · HSM · oRGB · Prismatic
Perceptual OKLCH · CIELAB · CAM16 · OKLab · HCT · Okhsl · Okhsv · Okhwb · OKLrAB · OKLrCH · SRLAB2 · proLab · sUCS · IgPgTg · HelmGen · HelmGen LCh · Jzazbz · JzCzHz · IPT · IPT Ragoo 2021 · Izazbz · hdr-IPT · IaPbP · CIELChab · CIELUV · HSLuv · CIELChuv · CIELAB D65 · CIELCh D65 · Msh · HPLuv · DIN99 · DIN99o Lab · DIN99o LCh · DIN99c · DIN99d · Hunter Lab · Hunter Rd,a,b · CIE 1960 UCS · CIE 1964 UVW · Adams–Nickerson Lab · hdr-CIELAB · CIECAM02 · CAM16-UCS · ZCAM · CAM02-UCS · CAM16-LCD · CAM16-SCD · CAM02-LCD · CAM02-SCD · Hellwig 2022 · sCAM · Kim 2009 · RLAB · LLAB · Nayatani 95 · Hunt · ATD95
Colorimetry & research CIE XYZ (D65) · CIE xyY · LMS · CIE XYZ (D50) · CIE 1976 u′v′ · CCT + Duv · Color temperature (Kelvin) · Maxwell triangle · Wavelength · Absolute XYZ D65 · LogLuv · MacLeod–Boynton · DKL · Grayscale · Dominant wavelength / DSH · rg chromaticity · Yrg (Kirk 2019) · XYB · OSA-UCS · TSL · YES · Ohta I₁I₂I₃ · lαβ
Video & broadcast BT.709 Y′CbCr · ICtCp · ICtCp HLG · IPT-PQ-C2 · BT.2020 Y′CbCr · BT.601 525-line Y′CbCr · BT.601 625-line Y′CbCr · YCbCr (parameterized) · YUV · YIQ · YPbPr · YCgCo · JPEG YCbCr · YDbDr · YcCbcCrc · xvYCC · SMPTE-C · PhotoYCC · Rec. 2100 PQ · Rec. 2100 HLG · Linear Rec. 2100 · ICaCb · Y′D′zD′x
Film & camera ACEScg · ARRI LogC3 · ARRI Wide Gamut 3 · ACEScc · Sony S-Log3 · S-Gamut3 · Sony S-Gamut3.Cine · ACES2065-1 · ACEScct · ARRI LogC4 · ARRI Wide Gamut 4 · Cineon · DaVinci Wide Gamut / Intermediate · DaVinci Wide Gamut · Sony S-Log2 · Panasonic V-Log · V-Gamut · RED Log3G10 · REDWideGamutRGB · Canon Log · Canon Log 2 · Canon Log 3 · DCI-P3+ · Fujifilm F-Log · Fujifilm F-Log2 · Fujifilm F-Log2 C · Nikon N-Log · Apple Log · Apple Log 2 · Blackmagic Film Gen 5 · Blackmagic Wide Gamut · DJI D-Log · D-Gamut · FilmLight T-Log / E-Gamut · E-Gamut · Kinefinity KineLOG3 · DCDM X′Y′Z′ · Sony S-Log · ACESproxy · ERIMM RGB · Leica L-Log · GoPro Protune · GoPro GP-Log2 · Insta360 I-Log · Xiaomi Mi-Log · OPPO O-Log · O-Log2 · Samsung Log · REDLog · REDLogFilm · RED Log3G12 · Panalog · ViperLog · Filmic Pro 6
Print & paint CMYK · Munsell · RYB · CMY · RAL Design · Coloroid · Ostwald
A complete collection of color spaces: one minimal API, verified formulas. While alternatives focus on digital color spaces, this project takes broader perspective, covering historical and cross-disciplinary spaces as well. Side effects: corrected papers, color education, test cases for JS→WASM compilers (porffor, jz).
It is not a color toolbox — parsing, interpolation, ΔE, gamut mapping, contrast, palettes, alpha stay out. Pantone, NCS, RAL Classic, and similar licensed swatch catalogs aren't open and stay out as well.
Thanks to the researchers, theorists, specifiers, implementors and the libraries that helped this one happen.
Library | Spaces | Ranges | Camera log · CAM · historic | Backends | Speed (M op/s)¹ |
color-space | 205 | Conventional | ✅ | JS · WASM · GLSL/WGSL · LUT · ICC | 5.52 |
color-space/lite | 54 | Conventional | logs · HDR · CAM16 | JS · 29 kB gzip | 3.01 ² |
color-space/wasm | 54 | Conventional | logs · HDR · CAM16 | WASM | 1.38–4.78× JS batches ³ |
30 | 0–1 | ❌ | JS | 4.46 | |
~40 | 0–1 | some | JS | 0.23 | |
~16 | 0–1 | ❌ | JS | 3.49 ² | |
~12 | mixed | ❌ | JS | 1.19 ² | |
6 | mixed | ❌ | JS | 9.35 ² |
¹ geometric mean, million scalar calls per second over the 7 shared npm run benchmark conversions (rgb ⇄ lab · hsl · oklab, rgb → p3), inputs rotating through a 256-color table; median of 3 runs on 2026-10-03 as the benchmark prints it, Node 22.22 / Intel Xeon 2.1 GHz (4 vCPU), culori 4.0.2 · colorjs.io 0.5.2 · @texel/color 1.1.11 · chroma-js 3.2.0 · d3-color 3.1.0. Absolute figures move with the machine; the ratios are the claim · ² measured on the subset it implements — color-space on the same subset: lite's 4 (lab, oklab; measured before lite gained hsl and p3) 3.09 · texel's 3 (oklab, p3) 2.76 · chroma-js's 6 6.45 · d3-color's 4 (lab, hsl) 9.28 · ³ WASM speedup over the JS batch API, rgb → each of the 26 targets it had then over 1M pixels (the 27 added since are not yet measured), per-target medians of 3 further runs the same day (lowest on Jzazbz and JzCzHz)
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