Convert a color between any two of the 221 color spaces, identity included, in each space's conventional ranges (rgb 0-255, oklch L 0-1 / C 0-0.4 / H 0-360, lab L 0-100 …). The color goes in as a CSS string (color) or as channel values (from + values); a batch as colors – tuples in from, CSS strings, or both. Out-of-range in, unclamped out: inRange flags each channel against the target's conventional range (rgb below 0 means outside sRGB); null = undefined at that coordinate.

Which standard display gamuts hold a color — sRGB ⊂ Display P3 ⊂ Rec. 2020, each tested in its own RGB box straight from the source space, the same ladder as the color-space.io gamut pill. smallest is the tightest one; null = beyond Rec. 2020. Membership only: nothing is gamut-mapped.

A color as CSS Color 4 strings — rgb(), hsl(), hwb(), lab(), lch(), oklab(), oklch() and color(display-p3 | a98-rgb | prophoto-rgb | rec2020 | srgb-linear | xyz-d65 | xyz-d50) — plus #hex inside sRGB. Converted, never gamut-mapped: a string is null where CSS would clamp it into a different color (rgb/hsl/hwb outside sRGB, lightness out of range). gamut is the smallest display gamut that holds the color.

The dossier of one color space: display name (as color-space.io shows it), description, channels + conventional ranges, defining references, provenance (year, author), illuminant/observer, encoding class, family and purpose, and its direct conversion neighbours.

List the 221 color spaces with display name, family, purpose, channels and one-line use. Optional filters: query (words matched against id, name, use line and description; best matches first), family, purpose.

Render a conversion as a .cube LUT file (Resolve, Premiere, Final Cut, OBS, ffmpeg). The header carries the measured deviation vs the direct conversion. Pure per-channel transfers auto-emit 1D. Size ≤ 33 here (larger via the library or https://color-space.io/).

The conversion as shader source – GLSL (WebGL2; WebGL1 too unless the path reads a table), WGSL (WebGPU), HLSL (DirectX, Unity, Unreal) or MSL (Metal) – with an entry function <from>_<to> (hyphens stripped), e.g. vec3 rgb_oklch(vec3 c), plus every function on the path. Each language is differentially tested against the library and compiled on real GPUs: use it instead of writing color matrices. HLSL and MSL need the optional peer naga-wasm installed beside color-space.

One space as an ICC v2 profile (.icc): matrix + tone curve where the space is an RGB working space (Photoshop, OS color management), a CLUT on a Lab PCS otherwise (lcms, ArgyllCMS, ImageMagick). Returned as a base64 embedded resource; class, pcs and bytes describe it.

The conversion as code to paste: the color-space JS call with its result and – where one exists for the space on the non-sRGB side – the colour-science (Python) equivalent verified against color-space (sRGB ↔ that space), with any named caveat. The color goes in as a CSS string or as values in from (default: sRGB 200, 100, 50).