imagegen

Original：🇺🇸 English
Translated

AI image generation using Google Gemini (Gemini) and OpenAI GPT-Image. Generate, edit, iterate, and create assets.

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Sourcethrownlemon/claude-code-plugins
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NPX Install

npx skill4agent add thrownlemon/claude-code-plugins imagegen

Tags

Translated version includes tags in frontmatter
ai-image-generationgoogle-geminiopenai-gpt-imageimage-editingasset-creation

SKILL.md Content

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Image Generation Skill

This skill enables AI-powered image generation, editing, and asset creation using Google Gemini (Gemini) and OpenAI GPT-Image.

When to Use

Activate this skill when the user wants to:
  • Generate images from text descriptions
  • Edit or modify existing images
  • Create project assets (icons, favicons, social images)
  • Generate design inspiration (moodboards)
  • Create consistent character designs
  • Compare different AI image providers

Available Commands

CommandUse For
/imagegen:generate
Generate images from prompts
/imagegen:edit
Edit existing images
/imagegen:iterate
Refine images through multiple steps
/imagegen:compare
Compare Google vs OpenAI
/imagegen:assets
Generate project assets
/imagegen:moodboard
Create design inspiration sets
/imagegen:character
Create consistent character sheets
/imagegen:config
Configure defaults

Delegation

For complex image generation tasks, delegate to the 
image-generator
subagent which has access to all generation scripts and can handle multi-step workflows.

Quick Reference

Providers

Google Gemini (Gemini)
  • Models: 
    gemini-2.5-flash-image
    , 
    gemini-3-pro-image-preview
  • Best for: Character consistency, multi-turn iteration, style variety
  • API Key: 
    GEMINI_API_KEY
    or 
    GOOGLE_API_KEY
OpenAI GPT-Image
  • Models: 
    gpt-image-1.5
    , 
    gpt-image-1
    , 
    gpt-image-1-mini
  • Best for: Text in images, transparent backgrounds, precise edits
  • API Key: 
    OPENAI_API_KEY

Common Sizes/Aspect Ratios

FormatGoogleOpenAI
Square1:11024x1024
Landscape16:91536x1024
Portrait9:161024x1536
Wide21:9-

Example Interactions

User: "Generate an image of a sunset over mountains" Action: Use 
/imagegen:generate --prompt "A sunset over mountains"
User: "Create app icons for my project" Action: Use 
/imagegen:assets --type icons --prompt "[ask for description]"
User: "Edit this image to add rain" Action: Use 
/imagegen:edit --image [path] --prompt "Add rain falling"
User: "I want to iterate on this design" Action: Use 
/imagegen:iterate --image [path] --prompt "[refinement]"
User: "Which provider would be better for logos?" Action: Explain Google is better for style variety, OpenAI for text, and suggest 
/imagegen:compare
to test both.

Prerequisites Check

Before generating, verify:
  1. Required Python packages: 
    google-genai
    , 
    openai
    , 
    Pillow
    (for resizing)
  2. API keys set in environment
  3. Output directory accessible
bash
# Install packages
pip install google-genai openai Pillow

# Set API keys (user's responsibility)
export GEMINI_API_KEY=your_key
export OPENAI_API_KEY=your_key

Prompt Tips

Help users craft effective prompts:
  • Be descriptive but concise
  • Specify style (photorealistic, watercolor, minimalist)
  • Include lighting (golden hour, dramatic, soft)
  • Mention composition (close-up, wide shot, centered)
  • For characters, include distinctive features
  • For logos, specify simplicity level