nano-banana-2（纳米香蕉 2）

Nano Banana 2 Image Generation & Editing

Generate and edit images using Google's Nano Banana 2 (Imagen) — the latest AI image generation model with industry-leading text rendering, multi-object composition, and photorealistic output.

This skill supports two providers. Choose based on which API key is available.

Provider Selection

1. If ATLASCLOUD_API_KEY is set → use Atlas Cloud
2. If GEMINI_API_KEY is set → use Google AI Studio
3. If both are set → prefer Atlas Cloud (flat-rate pricing)
4. If neither is set → ask the user to configure one:

- Atlas Cloud: Sign up at https://www.atlascloud.ai, Console → API Keys → Create key, then export ATLASCLOUD_API_KEY="your-key" - Google AI Studio: Get key from https://aistudio.google.com/apikey, then export GEMINI_API_KEY="your-key"

Pricing Comparison

Atlas Cloud uses flat-rate pricing — same price regardless of resolution. Google AI Studio uses token-based pricing that scales with resolution. At 4K, Atlas Cloud Developer tier is up to 63% cheaper than Google AI Studio.

Available Models

Atlas Cloud Models

Google AI Studio Model

Mode 1: Atlas Cloud API

Setup

1. Sign up at https://www.atlascloud.ai
2. Console → API Keys → Create new key
3. Set env: export ATLASCLOUD_API_KEY="your-key"

Parameters

Text-to-Image:

Image Editing — same as above plus:

Workflow: Submit → Poll → Download

# Step 1: Submit
curl -s -X POST "https://api.atlascloud.ai/api/v1/model/generateImage" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2/text-to-image",
    "prompt": "A serene Japanese garden with cherry blossoms",
    "aspect_ratio": "16:9",
    "resolution": "2k"
  }'
# Returns: { "code": 200, "data": { "id": "prediction-id" } }

# Step 2: Poll (every 3 seconds until "completed" or "succeeded")
curl -s "https://api.atlascloud.ai/api/v1/model/prediction/{prediction-id}" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY"
# Returns: { "code": 200, "data": { "status": "completed", "outputs": ["https://...url..."] } }

# Step 3: Download
curl -o output.png "IMAGE_URL_FROM_OUTPUTS"

Image editing example:

curl -s -X POST "https://api.atlascloud.ai/api/v1/model/generateImage" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2/edit",
    "prompt": "Change the sky to a dramatic sunset",
    "images": ["https://example.com/photo.jpg"],
    "resolution": "2k"
  }'

Polling logic:

• processing / starting / running → wait 3s, retry
• completed / succeeded → done, get URL from data.outputs[]
• failed → error, read data.error

Atlas Cloud MCP Tools (if available)

If the Atlas Cloud MCP server is configured, use built-in tools:

atlas_quick_generate(model_keyword="nano banana 2", type="Image", prompt="...")
atlas_generate_image(model="google/nano-banana-2/text-to-image", params={...})
atlas_get_prediction(prediction_id="...")

Mode 2: Google AI Studio API

Setup

1. Get API key from https://aistudio.google.com/apikey
2. Set env: export GEMINI_API_KEY="your-key"

Parameters

Text-to-Image

curl -s -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [{"parts": [{"text": "A serene Japanese garden with cherry blossoms"}]}],
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"],
      "imageConfig": {"aspectRatio": "16:9", "imageSize": "2K"}
    }
  }'

Response: base64 image in candidates[0].content.parts[]. Text parts have .text, image parts have .inline_data.mime_type and .inline_data.data.

Save the image:

# Extract base64 data from response and decode
echo "$BASE64_DATA" | base64 -d > output.png

Image Editing (Google AI Studio)

curl -s -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [{"parts": [
      {"text": "Change the sky to a dramatic sunset"},
      {"inline_data": {"mime_type": "image/png", "data": "BASE64_ENCODED_IMAGE"}}
    ]}],
    "generationConfig": {"responseModalities": ["TEXT", "IMAGE"]}
  }'

To encode a local image for editing:

BASE64_IMAGE=$(base64 -i input.png)

Python Example

from google import genai
from google.genai import types

client = genai.Client()
response = client.models.generate_content(
    model="gemini-3.1-flash-image-preview",
    contents="A serene Japanese garden with cherry blossoms",
    config=types.GenerateContentConfig(
        response_modalities=['TEXT', 'IMAGE'],
        image_config=types.ImageConfig(aspect_ratio="16:9", image_size="2K"),
    )
)
for part in response.parts:
    if part.text:
        print(part.text)
    elif image := part.as_image():
        image.save("output.png")

Implementation Guide

1. Determine provider: Check which API key is available (see Provider Selection above).
2. Extract parameters:

- Prompt: the image description - Aspect ratio: infer from context (banner→16:9, portrait→9:16, square→1:1, phone wallpaper→9:16, desktop→16:9) - Resolution: default 1k, use 2k/4k for high quality - For editing: identify source image URL(s) or local file path

1. Choose model tier (Atlas Cloud only):

- Standard for production use - Developer if user wants to save costs or is experimenting

1. Execute:

- Atlas Cloud: POST to generateImage API → poll prediction → download result - Google AI Studio: POST to generateContent API → parse base64 from response → save to file

1. Present result: show file path, offer to open

Prompt Tips

• Style: "oil painting", "photorealistic", "anime style", "watercolor"
• Lighting: "golden hour", "studio lighting", "neon glow"
• Composition: "close-up", "wide angle", "bird's eye view"
• Mood: "serene", "dramatic", "whimsical"
• Text in images: Nano Banana 2 renders text well — include it in quotes in your prompt