Generates and edits images using Google Gemini 3 Pro via Python CLI scripts. Supports text-to-image, editing, aspect ratios, 2K/4K output. Useful for AI image generation tasks.
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Generate and edit images using Google's Gemini 3 Pro Image model (`gemini-3-pro-image-preview`, nicknamed "Nano Banana Pro" 🍌).
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Generate and edit images using Google's Gemini 3 Pro Image model (gemini-3-pro-image-preview, nicknamed "Nano Banana Pro" 🍌).
Required:
GEMINI_API_KEY - Get from Google AI Studiogoogle-genai packageInstall dependencies:
pip install google-genai pillow
python3 <skill_dir>/scripts/generate.py "a cute robot mascot, pixel art style" -o robot.png
python3 <skill_dir>/scripts/generate.py "make the background blue" -i input.jpg -o output.png
python3 <skill_dir>/scripts/generate.py "cinematic landscape" --ratio 21:9 -o landscape.png
python3 <skill_dir>/scripts/generate.py "professional product photo" --size 4K -o product.png
scripts/generate.pyMain image generation script.
Usage: generate.py [OPTIONS] PROMPT
Arguments:
PROMPT Text prompt for image generation
Options:
-o, --output PATH Output file path (default: auto-generated)
-i, --input PATH Input image for editing (optional)
-r, --ratio RATIO Aspect ratio (1:1, 16:9, 9:16, 21:9, etc.)
-s, --size SIZE Image size: 2K or 4K (default: standard)
--search Enable Google Search grounding for accuracy
-v, --verbose Show detailed output
Supported aspect ratios:
1:1 - Square (default)2:3, 3:2 - Portrait/Landscape3:4, 4:3 - Standard4:5, 5:4 - Photo9:16, 16:9 - Widescreen21:9 - Ultra-wide/Cinematicscripts/batch_generate.pyGenerate multiple images with sequential naming.
Usage: batch_generate.py [OPTIONS] PROMPT
Arguments:
PROMPT Text prompt for image generation
Options:
-n, --count N Number of images to generate (default: 10)
-d, --dir PATH Output directory
-p, --prefix STR Filename prefix (default: "image")
-r, --ratio RATIO Aspect ratio
-s, --size SIZE Image size (2K/4K)
--delay SECONDS Delay between generations (default: 3)
Example:
python3 <skill_dir>/scripts/batch_generate.py "pixel art logo" -n 20 -d ./logos -p logo
You can also use the module directly:
from generate import generate_image, edit_image
# Generate image
result = generate_image(
prompt="a futuristic city at night",
output_path="city.png",
aspect_ratio="16:9",
image_size="4K"
)
# Edit existing image
result = edit_image(
prompt="add flying cars to the sky",
input_path="city.png",
output_path="city_edited.png"
)
| Variable | Description | Default |
|---|---|---|
GEMINI_API_KEY | Google Gemini API key | Required |
IMAGE_OUTPUT_DIR | Default output directory | ./nanobanana-images |
Create images from text descriptions. The model excels at:
Transform existing images with natural language:
Enable --search for factually accurate images involving:
Good prompts include:
Example:
"A cozy coffee shop interior, warm lighting, vintage aesthetic,
wooden furniture, plants on shelves, morning sunlight through windows,
soft focus background, 35mm film photography style"
"API key not found"
GEMINI_API_KEY environment variable--api-key option"No image in response"
"Rate limit exceeded"