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Génère et édite des images via l'API Gemini Image de Google (Nano Banana) en ligne de commande.

Points forts

Génération rapide avec le modèle Nano Banana standard
Édition d'images existante (remplacement d'arrière-plan, modification de contenu)
Support du modèle Pro pour des visuels de qualité professionnelle
Utilisation simple via uv, sans installation manuelle

Limites

Nécessite une clé API Gemini et une connexion Internet
Coût par image (environ $0,039 pour Nano Banana)
La qualité dépend du modèle choisi et du prompt

Quand l'utiliser

Idéal pour créer rapidement des visuels, des infographies ou modifier des images sans outil graphique complexe.

Quand l'éviter

À éviter pour des montages photo très précis ou des retouches professionnelles nécessitant un logiciel de bureau.

Exemples

Generate a futuristic cityscape

Generate an image of a futuristic city at sunset with flying cars and neon lights.

Edit an image background

Edit this image: change the background to a beach sunset. The image is at /path/to/photo.jpg.

Create an infographic

Create an infographic about renewable energy sources using the Pro model.

name: nano-banana-imagegen description: Generate and edit images using Google's Nano Banana (Gemini Image API). Use when the user wants to create AI-generated images, edit existing images, create infographics, generate product mockups, design social media graphics, or perform any image generation/manipulation task. Requires GEMINI_API_KEY environment variable.

Nano Banana Image Generation

Generate and edit images using Google's Gemini Image models (Nano Banana and Nano Banana Pro).

Prerequisites

API Key: Set the GEMINI_API_KEY environment variable
- Get key from: https://aistudio.google.com/apikey
uv: The script uses inline dependencies with uv (no manual install needed)

Quick Start

Using the Script

# Generate an image
uv run scripts/generate_image.py "A futuristic city at sunset" -o city.png

# Edit an existing image
uv run scripts/generate_image.py "Remove the background" -i photo.jpg -o edited.png

# Use Nano Banana Pro for higher quality
uv run scripts/generate_image.py "Create a detailed infographic" -m pro -o infographic.png

Direct Python Usage (with uv)

uv run --with google-genai python -c '
from google import genai
import os

client = genai.Client(api_key=os.environ["GEMINI_API_KEY"])

response = client.models.generate_content(
    model="gemini-2.5-flash-image",
    contents=["Create an image of a cat wearing a space helmet"]
)

for part in response.candidates[0].content.parts:
    if part.inline_data:
        with open("output.png", "wb") as f:
            f.write(part.inline_data.data)
        print("Saved to output.png")
'

Model Selection

| Model | Use Case | |-------|----------| | gemini-2.5-flash-image (Nano Banana) | Fast generation, iterations, high volume | | gemini-3-pro-image-preview (Nano Banana Pro) | Professional quality, text rendering, complex prompts |

Common Tasks

Image Generation

uv run scripts/generate_image.py "A serene Japanese garden with cherry blossoms" -o garden.png

Image Editing

uv run scripts/generate_image.py "Change the background to a beach sunset" -i input.jpg -o edited.png

Infographics (use Pro model)

uv run scripts/generate_image.py "Create an infographic about renewable energy" -m pro -o infographic.png

Resources

Script: scripts/generate_image.py - CLI tool with inline uv dependencies
API Reference: See references/api_reference.md for detailed SDK usage
Prompting Guide: See references/prompting_guide.md for effective prompts

Pricing

~$0.039 per image for Nano Banana (1290 tokens per image at $30/1M tokens)

Génération d'images Nano Banana

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