gh-dnvriend-gemini-nano-banana-tool-plugins-gemini-nano-banana-tool/commands/generate-conversation.md

Generate Conversation Command

Multi-turn image generation with progressive refinement. Each turn builds on previous context, allowing iterative improvements without starting over.

Usage

gemini-nano-banana-tool generate-conversation PROMPT -o OUTPUT [OPTIONS]

Arguments

• PROMPT - Text prompt for this turn (required)

Required Options

• -o, --output PATH - Output image file path (required)

Conversation Options

• -f, --file PATH - Conversation file (creates new if doesn't exist)
• -a, --aspect-ratio TEXT - Aspect ratio (default: 1:1, only for new conversations)
• -m, --model TEXT - Gemini model (default: gemini-2.5-flash-image, only for new)

Authentication Options

• --api-key TEXT - Override API key from environment
• --use-vertex - Use Vertex AI instead of Developer API
• --project TEXT - Google Cloud project (for Vertex AI)
• --location TEXT - Google Cloud location (for Vertex AI)

Other Options

• -v, --verbose - Multi-level verbosity (-v INFO, -vv DEBUG, -vvv TRACE)

How It Works

1. First Turn: Create initial image from prompt, save conversation state
2. Subsequent Turns: Previous output automatically becomes reference image
3. Persistence: All turns, prompts, and metadata saved to JSON file
4. Resume: Load conversation file to continue refinement

Examples

Basic Multi-Turn Workflow

# Turn 1: Initial generation
gemini-nano-banana-tool generate-conversation "A sunset over mountains" \
  -o sunset1.png --file conversation.json

# Turn 2: Refinement (loads conversation automatically)
gemini-nano-banana-tool generate-conversation "Make the sky more orange" \
  -o sunset2.png --file conversation.json

# Turn 3: Further refinement
gemini-nano-banana-tool generate-conversation "Add a lake in the foreground" \
  -o sunset3.png --file conversation.json

Interior Design Example

# Turn 1: Initial room
gemini-nano-banana-tool generate-conversation \
  "A modern minimalist living room with large windows" \
  -o room-v1.png --file interior.json -a 16:9

# Turn 2: Add furniture
gemini-nano-banana-tool generate-conversation \
  "Add a gray sofa and wooden coffee table" \
  -o room-v2.png --file interior.json

# Turn 3: Adjust lighting
gemini-nano-banana-tool generate-conversation \
  "Make the lighting warmer and add floor lamp" \
  -o room-v3.png --file interior.json

# Turn 4: Final touches
gemini-nano-banana-tool generate-conversation \
  "Add plants and artwork on the walls" \
  -o room-final.png --file interior.json

Product Photography Example

# Turn 1: Initial product shot
gemini-nano-banana-tool generate-conversation \
  "Professional product photo of wireless headphones" \
  -o headphones-v1.png --file product.json -a 1:1

# Turn 2: Adjust angle
gemini-nano-banana-tool generate-conversation \
  "Rotate to show the left side" \
  -o headphones-v2.png --file product.json

# Turn 3: Change background
gemini-nano-banana-tool generate-conversation \
  "Change background to dark gradient" \
  -o headphones-v3.png --file product.json

Conversation File Format

The conversation file stores complete history in JSON:

{
  "conversation_id": "20251120_181305",
  "model": "gemini-2.5-flash-image",
  "aspect_ratio": "16:9",
  "turns": [
    {
      "prompt": "A sunset over mountains",
      "output_path": "/path/to/sunset1.png",
      "reference_images": [],
      "metadata": {
        "token_count": 1295,
        "resolution": "1344x768",
        "finish_reason": "STOP"
      },
      "timestamp": "2025-11-20T18:13:11.428020"
    },
    {
      "prompt": "Make the sky more orange",
      "output_path": "/path/to/sunset2.png",
      "reference_images": ["/path/to/sunset1.png"],
      "metadata": {
        "token_count": 1554,
        "resolution": "1344x768",
        "finish_reason": "STOP"
      },
      "timestamp": "2025-11-20T18:13:27.318416"
    }
  ],
  "created_at": "2025-11-20T18:13:05.751502",
  "updated_at": "2025-11-20T18:13:27.318430"
}

Use Cases

• Product Photography: Iteratively adjust lighting, angles, styling
• Character Design: Refine poses, clothing, expressions progressively
• Interior Design: Build rooms by adding furniture and decor step by step
• Marketing Materials: Test variations while maintaining consistency
• Concept Art: Explore different iterations of a design
• Fashion E-commerce: Try products on models or in different settings

Important Notes

• Model & Aspect Ratio: Only set when creating new conversation (locked for subsequent turns)
• Reference Images: Previous output automatically used (no manual -i needed)
• Resume Anytime: Load conversation file to continue from any turn
• No File Flag: Can use without --file but conversation won't be saved

Why Use Conversation Mode?

• Progressive Refinement: Iteratively improve without losing context
• Experiment Safely: Try variations while maintaining consistency
• Context Awareness: Each turn references previous outputs automatically
• Evolution Tracking: Complete history of prompts and changes
• Resume Anytime: Continue conversations across sessions

Cost Information

Each turn costs the same as a single generation:

• Flash Model: ~$0.039 per turn
• Pro Model 1K/2K: ~$0.134 per turn
• Pro Model 4K: ~$0.24 per turn

Cost is tracked per turn in conversation file metadata.

Authentication

Set environment variable:

export GEMINI_API_KEY='your-api-key'

Get API key: https://aistudio.google.com/app/apikey