nano-image-generator

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Generate images using Nano Banana Pro (Gemini 3 Pro Preview). Use when creating app icons, logos, UI graphics, marketing banners, social media images, illustrations, diagrams, or any visual assets. Triggers include phrases like 'generate an image', 'create a graphic', 'make an icon', 'design a logo', 'create a banner', or any request needing visual content.

7installs
Sourcesolidspoon/dashplayer
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NPX Install

npx skill4agent add solidspoon/dashplayer nano-image-generator

Tags

Translated version includes tags in frontmatter
image-generationgemini-3-proprompt-engineeringai-visual-toolspython-script

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Nano Image Generator

Generate images using Nano Banana Pro (Gemini 3 Pro Preview) for any visual asset needs.

Requirements

在项目根目录 
.env
中配置：
  • apikey
    （或 
    APIKEY
    ）
  • baseurl
    （或 
    BASEURL
    ，例如 
    https://generativelanguage.googleapis.com/v1beta/models
    ）
兼容回退：若未找到 
apikey/APIKEY
，脚本会尝试 
GEMINI_API_KEY
。

Quick Start

bash
python scripts/generate_image.py "A friendly robot mascot waving" --output ./assets/mascot.png

Script Usage

bash
python scripts/generate_image.py <prompt> --output <path> [options]
Required:
  • prompt
    - Image description
  • --output, -o
    - Output file path
Options:
  • --aspect, -a
    - Aspect ratio (default: 
    1:1
    )
    • Square: 
      1:1
    • Portrait: 
      2:3
      , 
      3:4
      , 
      4:5
      , 
      9:16
    • Landscape: 
      3:2
      , 
      4:3
      , 
      5:4
      , 
      16:9
      , 
      21:9
  • --size, -s
    - Resolution: 
    1K
    , 
    2K
    (default), 
    4K

Workflow

  1. Determine output location - Place images where contextually appropriate:
    • App icons → 
      ./assets/icons/
      or 
      ./public/icons/
    • Marketing → 
      ./marketing/
      or 
      ./assets/images/
    • UI elements → 
      ./src/assets/
      or 
      ./public/images/
    • General → 
      ./generated/
  2. Craft effective prompts - Be specific and descriptive:
    • Include style: "flat design", "3D rendered", "watercolor", "minimalist"
    • Include context: "for a mobile app", "website hero image", "social media post"
    • Include details: colors, mood, composition
  3. Choose appropriate settings:
    • Icons/logos → 
      --aspect 1:1
    • Banners/headers → 
      --aspect 16:9
    • Mobile screens → 
      --aspect 9:16
    • Photos → 
      --aspect 3:2
      or 
      4:3

Examples

App icon:
bash
python scripts/generate_image.py "Minimalist flat design app icon of a lightning bolt, purple gradient background, modern iOS style" \
  --output ./assets/app-icon.png --aspect 1:1
Marketing banner:
bash
python scripts/generate_image.py "Professional website hero banner for a productivity app, abstract geometric shapes, blue and white color scheme, modern and clean" \
  --output ./public/images/hero-banner.png --aspect 16:9
High-quality illustration:
bash
python scripts/generate_image.py "Detailed isometric illustration of a cozy home office setup with plants, warm lighting, digital art style" \
  --output ./assets/illustrations/office.png --size 4K

Prompt Tips

  • Be specific - "A red apple on a wooden table" vs "an apple"
  • Include style - "in the style of pixel art" or "photorealistic"
  • Mention purpose - "for a children's book" affects the output style
  • Describe composition - "centered", "rule of thirds", "close-up"
  • Specify colors - Explicit color palettes yield better results
  • Avoid - Don't ask for text in images (use overlays instead)