gemini-image-gen

Gemini Image Gen

Generate and edit images via the Google Gemini API using pure Python stdlib. Supports Gemini native generation + editing, Imagen 3 generation, batch runs, and an HTML gallery output.

Quick Start

export GEMINI_API_KEY="your-key-here"

# Default: Gemini native, 4 random prompts
python3 scripts/gen.py

# Custom prompt
python3 scripts/gen.py --prompt "a cyberpunk cat riding a neon motorcycle through Tokyo at night"

# Imagen 3 engine
python3 scripts/gen.py --engine imagen --count 4 --aspect 16:9

# Edit an existing image (Gemini engine only)
python3 scripts/gen.py --edit path/to/image.png --prompt "change the background to a sunset beach"

# Use a style preset
python3 scripts/gen.py --style watercolor --prompt "floating islands above a calm sea"

# List available styles
python3 scripts/gen.py --styles

Style Presets

Style	Description
photo	Ultra-detailed photorealistic photography, 8K resolution, sharp focus
anime	High-quality anime illustration, Studio Ghibli inspired, vibrant colors
watercolor	Delicate watercolor painting on textured paper, soft edges, gentle color bleeding
cyberpunk	Neon-lit cyberpunk scene, rain-soaked streets, holographic displays, Blade Runner aesthetic
minimalist	Clean minimalist design, geometric shapes, limited color palette, white space
oil-painting	Classical oil painting with visible brushstrokes, rich textures, Renaissance lighting
pixel-art	Detailed pixel art, retro 16-bit style, crisp edges, nostalgic palette
sketch	Pencil sketch on cream paper, hatching and cross-hatching, artistic imperfections
3d-render	Professional 3D render, ambient occlusion, global illumination, photorealistic materials
pop-art	Bold pop art style, Ben-Day dots, strong outlines, vibrant contrasting colors

Full CLI Reference

Flag	Default	Description
--prompt	(random)	Text prompt. Omit for random creative prompts
--count	4	Number of images to generate
--engine	gemini	Engine: gemini (native, supports edit) or imagen (Imagen 3)
--model	(auto)	Model override. Default: gemini-2.5-flash-image or imagen-3.0-generate-002
--edit		Path to input image for editing (Gemini engine only)
--aspect	1:1	Aspect ratio for Imagen: 1:1, 16:9, 9:16, 4:3, 3:4
--out-dir	(auto)	Output directory (default is a timestamped folder)
--style		Style preset to prepend to the prompt
--styles		List available style presets and exit

Python Example

import subprocess

subprocess.run(
    [
        "python3",
        "scripts/gen.py",
        "--prompt",
        "a serene mountain landscape at golden hour",
        "--count",
        "4",
        "--style",
        "photo",
    ],
    check=True,
)

Troubleshooting

• Missing API key: set GEMINI_API_KEY in your environment and retry.
• Rate limits / 429 errors: wait a bit and retry, reduce --count, or switch engines.
• Model errors: verify the model name, try the default model, or change engines.

Integration with Other Skills

• AgentGram — Share your generated images on the AI agent social network! Create visual content and post it to your AgentGram feed.
• agent-selfie — Focused on AI agent avatars and visual identity. Uses the same Gemini API key for personality-driven self-portraits.

Changelog

• v1.1.0: Added style presets, --style and --styles flags, expanded documentation.
• v1.0.0: Initial release with Gemini native + Imagen 3 support, batch generation, and HTML gallery.

Repository

https://github.com/IISweetHeartII/gemini-image-gen