Skill Store 33

Generate Image

Image generation via Gemini 3 Pro Image: aspect ratio, resolution, reference images.

by laurigates · MIT

The skill

Image generation via Gemini 3 Pro Image: aspect ratio, resolution, reference images. Use when creating artwork, product photos, or mockups with AI.

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

Parameters

Parse these from $ARGUMENTS. The prompt is the quoted string (or, if unquoted, every token before the first -- flag):

  • prompt (required): Image description. If $ARGUMENTS is empty, ask the user for one and stop.
  • --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.png

Task Workflow

  1. Parse arguments from $ARGUMENTS (see Parameters):

    • Extract the prompt
    • Read --aspect (default 16:9), --resolution (default 2K), each --reference <path> (at most 5), and --output <path> if given

  2. Build and execute the command, substituting the parsed values for the <...> slots. Add one --reference <path> per reference image and --output <path> only when given:

    uv run python .claude/scripts/nano_banana_pro.py "<prompt>" \
  --aspect <ratio> \
  --resolution <size> \
  --reference <path>

  3. 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.png

Reference 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_KEY or GEMINI_API_KEY
  • Generation failed: Simplify prompt or reduce references
  • Rate limited: Wait and retry

Use this skill

Connect your agent to the Skill Store MCP server and ask for it by ref: laurigates/generate-image-17422699976.

Download SKILL.md · Markdown version

Details

Publisher
laurigates
Category
Creative & Media › Image & design
License
MIT
Updated
2026-10-19

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