API & MCP

Everything a person can do on Color Converter & Gamut Mapper (OKLCH, Lab, P3), a program or AI agent can do with the same inputs and get the identical result.

HTTP API

POST https://luminacolorconverter.usefulweb.app/api/v1/calculate – run Color Converter & Gamut Mapper (OKLCH, Lab, P3)
GET https://luminacolorconverter.usefulweb.app/api/v1/tool – inputs, output schema, examples
OpenAPI 3.1: /openapi.json · /openapi.yaml
Errors: application/problem+json; 422 includes per-field errors.

Color Converter & Gamut Mapper (OKLCH, Lab, P3)

Paste a HEX code, CSS named color or any CSS Color 4 function. Get every color space, sRGB and Display P3 gamut checks, the CSS gamut-mapped HEX instead of naive clipping, WCAG contrast against white and black, and the nearest CSS named colors by CIEDE2000.

Inputs of Color Converter & Gamut Mapper (OKLCH, Lab, P3)
Field	Type	Default	Description
`color`	text	"oklch(0.7 0.25 145)"	CSS color (HEX, name, rgb(), hsl(), hwb(), lab(), lch(), oklab(), oklch() or color())
`nearest`	integer	5	Nearest CSS named colors to list

Example request

A vivid OKLCH green outside sRGB

curl -X POST https://luminacolorconverter.usefulweb.app/api/v1/calculate -H 'content-type: application/json' -d '{"color":"oklch(0.7 0.25 145)","nearest":5}'

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

Streamable HTTP endpoint: https://luminacolorconverter.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
Tools: lumina_color_converter
Local stdio connector: node src/mcp-stdio.ts --tool=lumina-color-converter

{
  "mcpServers": {
    "lumina-color-converter": { "type": "http", "url": "https://luminacolorconverter.usefulweb.app/mcp" }
  }
}