{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://yukihamada.github.io/openformats/image/v1.json",
  "title": "image.json v1 — open image / visual asset format",
  "description": "1 画像 = 1 JSON。生成プロンプト・構図・レイヤ・派生サイズ・権利を記述。ラスタ/ベクタ/生成画像を同じ語彙で扱う。MIT。",
  "allOf": [{ "$ref": "https://yukihamada.github.io/openformats/core/envelope/v1.json" }],
  "type": "object",
  "required": ["kind", "id", "source"],
  "properties": {
    "kind": { "const": "image" },
    "source": {
      "type": "object",
      "description": "実体ファイル。",
      "required": ["path"],
      "properties": {
        "path": { "type": "string" },
        "format": { "type": "string", "examples": ["png", "jpg", "webp", "svg", "avif"] },
        "width": { "type": "integer" },
        "height": { "type": "integer" },
        "dpi": { "type": "number" },
        "color_space": { "type": "string", "examples": ["sRGB", "Display P3", "CMYK"] },
        "sha256": { "type": "string", "pattern": "^[a-f0-9]{64}$" }
      },
      "additionalProperties": true
    },
    "generation": {
      "type": "object",
      "properties": {
        "provider": { "type": "string", "examples": ["teai", "gemini", "midjourney", "sdxl"] },
        "model": { "type": "string" },
        "prompt": { "type": "string" },
        "negative_prompt": { "type": "string" },
        "seed": { "type": "integer" },
        "steps": { "type": "integer" }
      },
      "additionalProperties": true
    },
    "composition": {
      "type": "object",
      "description": "構図・被写体の記述。アクセシビリティの alt を必須運用。",
      "properties": {
        "alt": { "type": "string" },
        "subject": { "type": "array", "items": { "type": "string" } },
        "palette": { "type": "array", "items": { "type": "string" } },
        "tags": { "type": "array", "items": { "type": "string" } }
      },
      "additionalProperties": true
    },
    "layers": {
      "type": "array",
      "description": "重ね順のあるレイヤ (PSD/SVG 相当)。",
      "items": {
        "type": "object",
        "properties": {
          "name": { "type": "string" },
          "src": { "type": "string" },
          "opacity": { "type": "number" },
          "blend": { "type": "string" },
          "visible": { "type": "boolean", "default": true }
        },
        "additionalProperties": true
      }
    },
    "variants": {
      "type": "array",
      "description": "派生サイズ・形式。",
      "items": {
        "type": "object",
        "properties": {
          "label": { "type": "string", "examples": ["thumbnail", "hero", "social-9x16"] },
          "path": { "type": "string" },
          "width": { "type": "integer" },
          "height": { "type": "integer" },
          "sha256": { "type": "string", "pattern": "^[a-f0-9]{64}$" }
        },
        "additionalProperties": true
      }
    },
    "rights": {
      "type": "object",
      "properties": {
        "subject_release": { "type": "boolean", "description": "被写体の肖像許諾。" },
        "model_release": { "type": "boolean" },
        "ai_generated": { "type": "boolean" }
      },
      "additionalProperties": true
    }
  }
}