AI Image Generator CLI

A TypeScript-based command-line tool for generating AI images with custom sizes using OpenAI DALL-E.

Features

• Generate AI images from text prompts using DALL-E 3
• Support for custom aspect ratios (e.g., 3:2, 16:9) and dimensions (e.g., 1920x1080)
• Automatic image resizing and cropping to exact specifications
• Multiple output formats (PNG, JPG, WebP)
• Quality options (standard, HD)
• Style options (natural, vivid)
• Secure API key management

Installation

Using npx (Recommended - No Installation Required)

npx @tmgbabul/ai-image-gen generate "A serene mountain landscape" --size 3:2

Global Installation

npm install -g @tmgbabul/ai-image-gen
@tmgbabul/ai-image-gen generate "A serene mountain landscape" --size 3:2

Local Project Installation

npm install @tmgbabul/ai-image-gen
npx @tmgbabul/ai-image-gen generate "A serene mountain landscape" --size 3:2

Configuration

Before using the CLI, set your OpenAI API key:

npx @tmgbabul/ai-image-gen config set OPENAI_API_KEY sk-xxxxx

Alternatively, set the environment variable:

export OPENAI_API_KEY=sk-xxxxx

Configuration Commands

# Set a config value
npx @tmgbabul/ai-image-gen config set OPENAI_API_KEY sk-xxxxx

# Get a config value
npx @tmgbabul/ai-image-gen config get OPENAI_API_KEY

# Delete a config value
npx @tmgbabul/ai-image-gen config delete OPENAI_API_KEY

# List all config values
npx @tmgbabul/ai-image-gen config list

Configuration is stored in ~/.@tmgbabul/ai-image-gen/config.json.

Usage

Basic Usage

npx @tmgbabul/ai-image-gen generate "A serene mountain landscape at sunset"

If installed globally:

@tmgbabul/ai-image-gen generate "A serene mountain landscape at sunset"

With Options

# Generate with custom aspect ratio
npx @tmgbabul/ai-image-gen generate "Blog header image" --size 3:2 --output header.png

# Generate with custom dimensions
npx @tmgbabul/ai-image-gen gen "Featured image" -s 1920x1080 -o featured.png

# Generate with HD quality and vivid style
npx @tmgbabul/ai-image-gen gen "Sunset over ocean" -s 16:9 -q hd --style vivid

# Generate as JPG
npx @tmgbabul/ai-image-gen gen "Product photo" -s 1024x768 -f jpg

Command Options

Option	Alias	Type	Default	Description
<prompt>	-	string	required	Image description
--size	-s	string	1024x1024	Aspect ratio (3:2) or dimensions (1024x768)
--output	-o	string	./image-{timestamp}.png	Output file path
--quality	-q	enum	standard	standard or hd
--style	-	enum	natural	vivid or natural
--model	-m	string	dall-e-3	OpenAI model
--format	-f	enum	png	png, jpg, webp

Common Use Cases

Blog post hero image (3:2 aspect ratio):

npx @tmgbabul/ai-image-gen gen "Modern office workspace" -s 3:2 -o blog-hero.png

Wide banner (16:9):

npx @tmgbabul/ai-image-gen gen "Technology background" -s 16:9 -q hd

Social media post (1080x1080):

npx @tmgbabul/ai-image-gen gen "Inspirational quote background" -s 1080x1080

Custom dimensions:

npx @tmgbabul/ai-image-gen gen "Website header" -s 1920x600 -f webp

How It Works

DALL-E only supports three fixed sizes: 1024x1024, 1792x1024, and 1024x1792. This CLI handles custom sizes by:

1. Mapping your requested size to the closest DALL-E size
2. Generating the image at the DALL-E size
3. Using Sharp to resize/crop to your exact dimensions

Examples:

• 3:2 (1536x1024) → Generate at 1792x1024, crop to 1536x1024
• 16:9 (1920x1080) → Generate at 1792x1024, resize to 1920x1080
• 1024x768 → Generate at 1024x1024, resize to 1024x768

Development

# Install dependencies
npm install

# Build
npm run build

# Type check
npm run typecheck

# Development mode
npm run dev

Project Structure

@tmgbabul/ai-image-generator/
├── bin/
│   └── cli.js                    # Shebang entry point
├── src/
│   ├── index.ts                  # CLI entry with Commander
│   ├── commands/
│   │   ├── generate.ts           # Image generation command
│   │   └── config.ts             # Configuration command
│   ├── services/
│   │   ├── openai.ts             # OpenAI API wrapper
│   │   └── image-processor.ts   # Sharp-based processing
│   ├── utils/
│   │   ├── size-mapper.ts        # Size mapping logic
│   │   ├── config-manager.ts     # Config file handling
│   │   └── validators.ts         # Input validation
│   └── types/
│       └── index.ts              # TypeScript interfaces
├── package.json
├── tsconfig.json
└── tsup.config.ts

Error Handling

The CLI provides helpful error messages:

• ✗ OpenAI API key not found. Run: @tmgbabul/ai-image-gen config set OPENAI_API_KEY sk-xxxxx
• ✗ Invalid size format. Use aspect ratio (e.g., 3:2) or dimensions (e.g., 1024x768)
• ✗ Quality 'hd' requires dall-e-3 model

Requirements

• Node.js 18 or higher
• OpenAI API key with DALL-E access

License

MIT