{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "format",
    "version",
    "width",
    "height",
    "colors"
  ],
  "description": "Lumina Palette Studio color grid. Nine opaque encoded-sRGB colors in row order (top-left to bottom-right), blended bilinearly into a width × height PNG.",
  "properties": {
    "format": {
      "const": "lumina-color-grid"
    },
    "version": {
      "const": 1
    },
    "width": {
      "type": "integer",
      "minimum": 128,
      "maximum": 1024
    },
    "height": {
      "type": "integer",
      "minimum": 128,
      "maximum": 1024
    },
    "colors": {
      "type": "array",
      "minItems": 9,
      "maxItems": 9,
      "items": {
        "type": "string",
        "pattern": "^#[0-9a-fA-F]{6}$"
      }
    }
  }
}