# CIEDE2000 CIELAB Colour Difference Calculator

> CIEDE2000 CIELAB Colour Difference Calculator is a paid API for AI agents from detect.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-04).

Computes standardized CIEDE2000 perceptual colour difference scores between pairs of CIELAB colour values.

## Facts

- Endpoint: POST https://detect.halowerk.com/v1/F-TD2000-GEO-INDUSTRY-B002/cie2000-cielab-complete-perceptual-colour-difference?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ciede2000-cielab-colour-difference-calculator-68e3eb0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zgsrT37DMej57nHtxP8GZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ciede2000-cielab-colour-difference-calculator-68e3eb0a -d '<json body>'
```

Example prompt: Can you calculate the CIEDE2000 perceptual colour difference between these two CIELAB colours: [50, 25, -10] and [52, 22, -8]? I want to know how visually different they appear.

## When to prefer this

Use this endpoint when you need a standardized, numerically precise perceptual colour difference metric between CIELAB colour pairs. Prefer CIEDE2000 over older delta-E formulas (CIE76, CIE94) when perceptual uniformity and accuracy matter most, such as in print production, paint matching, display calibration, or colour quality control. Supports up to 32 pairs per call, making it efficient for small batch comparisons.

## Known failure modes

- Invalid CIELAB array length (must be exactly 3 values per colour)
- Too many pairs submitted (maximum 32 per request)
- Numeric values out of accepted range (-1,000,000 to 1,000,000)
- Missing required 'claim' field in the ciede object
- Malformed artifact structure causing schema validation failure
- Payment authorization failure via x402 protocol

## How this service works

Compute standardized colour difference between supplied CIELAB sample pairs.

## Output

Returns a structured artifact containing CIEDE2000 delta-E colour difference scores for each submitted CIELAB pair, quantifying perceptual dissimilarity using the standardized CIE 2000 formula. Higher values indicate greater perceived colour difference.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "artifact": {
   "type": "object",
   "required": [
    "ciede"
   ],
   "properties": {
    "ciede": {
     "type": "object",
     "required": [
      "data",
      "claim"
     ],
     "properties": {
      "data": {
       "type": "object",
       "required": [
        "pairs"
       ],
       "properties": {
        "pairs": {
         "type": "array",
         "items": {
          "type": "object",
          "required": [
           "left",
           "right"
          ],
          "properties": {
           "left": {
            "type": "array",
            "items": {
             "type": "number",
             "maximum": 1000000,
             "minimum": -1000000
            },
            "maxItems": 3,
            "minItems": 3
           },
           "right": {
            "type": "array",
            "items": {
             "type": "number",
             "maximum": 1000000,
             "minimum": -1000000
            },
            "maxItems": 3,
            "minItems": 3
           }
          },
          "additionalProperties": false
         },
         "maxItems": 32,
         "minItems": 1
        }
       },
       "additionalProperties": false
      },
      "claim": {}
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ciede2000-cielab-colour-difference-calculator-68e3eb0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from detect.halowerk.com](https://www.zero.xyz/host/detect.halowerk.com/llms.txt)