Generate images using Google's Nano Banana Pro (Gemini 3 Pro Image) model.
When to Use This Skill
| Use this skill when... | Use imagemagick-conversion instead when... |
|---|---|
| Producing a brand-new image from a text prompt | Converting, resizing, or compressing an existing image |
| Generating cinematic, product, or portrait artwork | Building thumbnails or batch-processing many files |
| Mixing up to five reference images into a new render | Applying deterministic transforms (rotate, crop, format) |
| Use this skill when... | Use mermaid-diagrams or d2-diagrams instead when... |
|---|---|
| The output is a photographic or illustrative image | The output is a flowchart, sequence, or architecture diagram |
| Quality settings (1K/2K/4K) and aspect ratio matter | Diagram-as-code rendering would be more maintainable |
Arguments
- {{arg:1}} (required): Image description
- --aspect: Aspect ratio (
1:1,2:3,3:2,3:4,4:3,4:5,5:4,9:16,16:9,21:9) - default:16:9 - --resolution: Image resolution (
1K,2K,4K) - default:2K - --reference: Path to reference image (repeatable, max 5)
- --output: Custom output path
Environment Requirements
Verify API key is set:
echo "API Key: ${GOOGLE_API_KEY:+SET}${GEMINI_API_KEY:+SET}"If not set, get one from: https://aistudio.google.com/apikey
Usage Examples
/generate-image "A beautiful mountain landscape at sunset"
/generate-image "Product photo on white background" --aspect 1:1 --resolution 4K
/generate-image "Portrait photo" --aspect 3:4
/generate-image "Cinematic scene" --aspect 21:9
/generate-image "Similar style" --reference existing_image.pngTask Workflow
- Parse arguments:
- Extract prompt from {{arg:1}} - Identify aspect ratio, resolution, and reference images
- Build command:
uv run python.claude/scripts/nano_banana_pro.py \ "{{arg:1}}" \ --aspect {{aspect|default:"16:9"}} \ --resolution {{resolution|default:"2K"}} \ {{reference_flags}} - Execute generation:
uv run python.claude/scripts/nano_banana_pro.py "PROMPT" --aspect RATIO --resolution SIZE - Report results:
- Show path to generated image - Note any reference images used - Offer next steps (regenerate, different aspect, etc.)
Output
Default output: ./generated/image_YYYYMMDD_HHMMSS.png
Custom output with --output:
/generate-image "Scene" --output custom_name.pngReference Images
Reference images help maintain consistency:
- Use existing images as style references
- Keep subjects consistent across generations
- Match artistic styles
When using references, describe the relationship:
- "Similar style to the reference"
- "This person in a different setting"
- "Same product, different angle"
Maximum 5 reference images per generation.
Aspect Ratio Quick Reference
| Use Case | Ratio |
|---|---|
| Square/Instagram | 1:1 |
| Portrait | 3:4, 9:16 |
| Landscape | 16:9 |
| Ultrawide | 21:9 |
| Photo | 3:2, 4:3 |
Resolution Quick Reference
| Use Case | Resolution |
|---|---|
| Preview | 1K |
| Standard | 2K |
| High quality | 4K |
Error Handling
- No API key: Set
GOOGLE_API_KEYorGEMINI_API_KEY - Generation failed: Simplify prompt or reduce references
- Rate limited: Wait and retry