創業70周年記念

# 🖼️ GPT-image-2 (OpenAI API) — 画像生成 使い方ガイド

## TOOL
**GPT-image-2** (OpenAI API)

## エンドポイント / モデル
- `POST https://api.openai.com/v1/images/generations`
- `model: "gpt-image-2"`
- 認証: OpenAI API キー (`Authorization: Bearer ...`)

## 主要パラメータ

| パラメータ | 値の例 |
|---|---|
| `size` | `"1024x1024"` (正方形 / SNS) / `"1024x1536"` (3:4 縦長 / マイソク) / `"1536x1024"` (16:9 / LP ヒーロー) |
| `quality` | `"medium"` (LP・チラシ標準) / `"high"` (印刷品質) |
| `response_format` | `"b64_json"` を推奨 (取得後に WebP/PNG に変換) |
| `n` | 通常 1 |

## 料金 (参考)
- `medium` 1024x1024 ≈ $0.053/枚
- `medium` 1024x1536 ≈ $0.080/枚

## 実投入するプロンプト本文

```text
A vintage-modern poster (3:4 vertical) celebrating an anniversary fair. Scene: a retrospective composition with a sepia-toned old photograph (visibly aged) of a 1965 Japanese furniture craftsman in workshop with handtools on the upper portion, transitioning to a modern crisp full-color photograph of a contemporary luxury 匠大塚 living room on the lower portion, joined by a thin gold diagonal line. Style: editorial design layout. Top text in classic Japanese serif: "受け継がれてきた、" (cream tone). Below larger gold serif: "本物への誇り。" Mid-section: "匠大塚 創業60周年 感謝フェア" (medium, dark navy). Bottom: "2026.5.15 - 6.30" (date). Bottom-right: refined kanji logo "匠大塚". Premium archival design feel. No watermarks.
```