imgen

Installation
SKILL.md

imgen - Azure OpenAI Image Generation CLI

How to Run

imgen is NOT globally installed. Use one of these methods:

# 開発モード(ソースから直接実行、.envを自動読み込み)
npm run dev --prefix /Volumes/Data/dev/imgen -- <command>

# npx でソースから実行(.envは自動読み込みされない)
npx tsx /Volumes/Data/dev/imgen/src/index.ts <command>

# npm パッケージとして実行(npm install -g @nogataka/imgen 済みの場合)
imgen <command>

以下の例では imgen と表記するが、実際は上記いずれかの方法で実行すること。

Quick Reference

imgen image gen "<prompt>" -q <quality> -s <size>    # 画像生成
imgen image edit <file> "<instruction>"               # 画像編集
imgen image explain <file> -l <lang>                  # 画像説明

Setup

環境変数または .env ファイルで Azure OpenAI の認証情報を設定する。

# 環境変数(最優先)
export AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com"
export AZURE_OPENAI_API_KEY="your-api-key"
export AZURE_OPENAI_DEPLOYMENT_NAME="gpt-5.1"
export AZURE_OPENAI_DEPLOYMENT_NAME_IMAGE="gpt-image-1.5"

.env ファイル探索順: cwd/.env~/.imgen/.env

Variable Description Default
AZURE_OPENAI_ENDPOINT Azure OpenAI resource endpoint (required)
AZURE_OPENAI_API_KEY Azure OpenAI API key (required)
AZURE_OPENAI_DEPLOYMENT_NAME Chat model deployment (required)
AZURE_OPENAI_DEPLOYMENT_NAME_IMAGE Image model deployment (required)
AZURE_OPENAI_API_VERSION Chat API version 2024-02-15-preview
AZURE_OPENAI_IMAGE_API_VERSION Image API version 2025-04-01-preview

Image Generation

imgen image gen [options] <theme>
Option Values Default
-s, --size 1024x1024, 1536x1024, 1024x1536 1024x1024
-q, --quality low, medium, high high
-f, --format png, jpg, webp png
-p, --preset builtin preset name -
-c, --context context file path (.md/.txt) -
-o, --output output path (file or directory) auto
-d, --debug enable debug logging false
--json JSON output format false
--dry-run preview settings without API call false

Recommended Settings

Use Case Quality Size
Product photo, landscape high 1536x1024
Illustration, icon, mascot high 1024x1024
Quick draft, prototype low 1024x1024
Portrait, vertical high 1024x1536

Examples

imgen image gen "夕日の海辺の風景" -q high -s 1536x1024
imgen image gen "可愛い猫のマスコット" -p builtin:square
imgen image gen "ミニマルなロゴデザイン" -o logo.png
imgen image gen "complex scene" --dry-run

Image Editing

imgen image edit [options] <file> <prompt>

Edit instructions in natural language:

  • Background change: "背景を青空に変更"
  • Style transfer: "水彩画風に変換"
  • Object modification: "色を鮮やかに"

Supported input formats: .jpg, .jpeg, .png, .gif, .webp

Option Values Default
-s, --size 1024x1024, 1536x1024, 1024x1536 1024x1024
-f, --format png, jpg, webp png
-o, --output output path auto
--json JSON output format false
--dry-run preview settings without API call false

Examples

imgen image edit photo.jpg "背景を青空に変更"
imgen image edit portrait.png "アニメスタイルに変換" -s 1536x1024
imgen image edit photo.png "edit" --dry-run

Image Explanation

imgen image explain [options] <file>
Option Values Default
-l, --lang ja, en, zh, ko, es, fr, de, it, ru, vi ja
-f, --format markdown, json markdown
-c, --context context info (text or .md/.txt file path) -
-o, --output output file path stdout

Examples

imgen image explain screenshot.png
imgen image explain photo.jpg -l en
imgen image explain chart.png -c "Q4 sales report" -f json

Builtin Presets

-p オプションで指定可能:

Name Size Quality
builtin:square 1024x1024 high
builtin:landscape 1536x1024 high
builtin:portrait 1024x1536 high
builtin:draft 1024x1024 low
builtin:photo 1536x1024 high

Option Priority

CLI options > Preset values (-p) > Default values

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Installs
17
GitHub Stars
17
First Seen
Mar 20, 2026