Nano Banana Pro OpenRouter
Overview
Generate or edit images with OpenRouter using the
google/gemini-3-pro-image-preview
model. Support prompt-only generation, single-image edits, and multi-image composition.
Prompt-only generation
uv run {baseDir}/scripts/generate_image.py \
--prompt "A cinematic sunset over snow-capped mountains" \
--filename sunset.png
Edit a single image
uv run {baseDir}/scripts/generate_image.py \
--prompt "Replace the sky with a dramatic aurora" \
--input-image input.jpg \
--filename aurora.png
Compose multiple images
uv run {baseDir}/scripts/generate_image.py \
--prompt "Combine the subjects into a single studio portrait" \
--input-image face1.jpg \
--input-image face2.jpg \
--filename composite.png
Resolution
Use
--resolution
with
1K
,
2K
, or
4K
.
Default is
1K
if not specified.
System prompt customization
The skill reads an optional system prompt from
assets/SYSTEM_TEMPLATE
. This allows you to customize the image generation behavior without modifying code.
Behavior and constraints
Accept up to 3 input images via repeated
--input-image
.
--filename
accepts relative paths (saves to current directory) or absolute paths.
If multiple images are returned, append
-1
,
-2
, etc. to the filename.
Print
MEDIA:
nano-banana-pro-openrouter
安装
npx skills add https://github.com/github/awesome-copilot --skill nano-banana-pro-openrouter