Nano Banana 構築ガイド：開発者向け完全チュートリアル

1prompt = "Restore and colorize this image from 1932"
2
3response = client.models.generate_content(
4    model="gemini-2.5-flash-image-preview",
5    contents=[prompt, image],
6)

1pip install -U google-genai
2# 画像操作用の Pillow ライブラリをインストール
3pip install Pillow

1npm install @google/genai

1from google import genai
2from PIL import Image
3from io import BytesIO
4
5# クライアントを API キーで設定
6client = genai.Client(api_key="YOUR_API_KEY")
7
8prompt = """Create a photorealistic image of an orange cat
9with a green eyes, sitting on a couch."""
10
11# API を呼び出してコンテンツを生成
12response = client.models.generate_content(
13    model="gemini-2.5-flash-image-preview",
14    contents=prompt,
15)
16
17# レスポンスにはテキストと画像データの両方が含まれる場合があります。
18# パーツを反復処理して画像を見つけて保存します。
19for part in response.candidates[0].content.parts:
20    if part.text is not None:
21        print(part.text)
22    elif part.inline_data is not None:
23        image = Image.open(BytesIO(part.inline_data.data))
24        image.save("cat.png")

1from google import genai
2from PIL import Image
3from io import BytesIO
4
5client = genai.Client(api_key="YOUR_API_KEY")
6
7prompt = """Using the image of the cat, create a photorealistic,
8street-level view of the cat walking along a sidewalk in a
9New York City neighborhood, with the blurred legs of pedestrians
10and yellow cabs passing by in the background."""
11
12image = Image.open("cat.png")
13
14# テキストプロンプトと画像の両方を 'contents' リストに渡します
15response = client.models.generate_content(
16    model="gemini-2.5-flash-image-preview",
17    contents=[prompt, image],
18)
19
20for part in response.candidates[0].content.parts:
21    if part.text is not None:
22        print(part.text)
23    elif part.inline_data is not None:
24        image = Image.open(BytesIO(part.inline_data.data))
25        image.save("cat2.png")

1from google import genai
2from PIL import Image
3from io import BytesIO
4
5client = genai.Client(api_key="YOUR_API_KEY")
6
7prompt = "Restore and colorize this image from 1932"
8
9image = Image.open("lunch.jpg")  # "摩天楼の上の昼食、1932年"
10
11response = client.models.generate_content(
12    model="gemini-2.5-flash-image-preview",
13    contents=[prompt, image],
14)
15
16for part in response.candidates[0].content.parts:
17    if part.text is not None:
18        print(part.text)
19    elif part.inline_data is not None:
20        image = Image.open(BytesIO(part.inline_data.data))
21        image.save("lunch-restored.png")

1from google import genai
2from PIL import Image
3from io import BytesIO
4
5client = genai.Client(api_key="YOUR_API_KEY")
6
7prompt = "Make the girl wear this t-shirt. Leave the background unchanged."
8
9image1 = Image.open("girl.png")
10image2 = Image.open("tshirt.png")
11
12response = client.models.generate_content(
13    model="gemini-2.5-flash-image-preview",
14    contents=[prompt, image1, image2],
15)
16
17for part in response.candidates[0].content.parts:
18    if part.text is not None:
19        print(part.text)
20    elif part.inline_data is not None:
21        image = Image.open(BytesIO(part.inline_data.data))
22        image.save("girl-with-tshirt.png")

1from google import genai
2from PIL import Image
3from io import BytesIO
4
5client = genai.Client(api_key="YOUR_API_KEY")
6
7# チャットを作成
8chat = client.chats.create(
9    model="gemini-2.5-flash-image-preview"
10)
11
12# 最初の画像編集を実行
13response1 = chat.send_message(
14    [
15        "Change the cat to a bengal cat, leave everything else the same",
16        Image.open("cat.png"),
17    ]
18)
19# 画像を表示/保存...
20
21# チャットと編集を続行
22response2 = chat.send_message("The cat should wear a funny party hat")
23# 画像を表示/保存...