Image Generator MCP Server

A Model Context Protocol (MCP) server that generates test images with customizable width, height, and color. Saves images as PNG files to specified file paths.

Features

• Generate test images with specified dimensions (1-4096 pixels)

• Support for hex color format (e.g., #FF0000, #f00)

• Automatic text overlay showing image dimensions

• Optional custom label text displayed in the top-left corner

• Smart contrast color selection for readable text

• Saves images as PNG files to specified file paths

• Automatically creates directories if they don't exist

Related MCP server: Placeholder Image Generator

Installation

1. Clone or download this repository

2. Install dependencies:

npm install

3. Build the server:

npm run build

4. Add the server to your MCP configuration:

For VSCode:

{
    "servers": {
        "Image Placeholder Gen": {
            "type": "stdio",
            "command": "node",
            "args": [
                "~/mcp_servers/image-gen/build/index.js"
            ]
        }
    }
}

For Claude Desktop:

{
  "mcpServers": {
    "image-gen": {
      "command": "node",
      "args": ["/path/to/image-gen/build/index.js"]
    }
  }
}

Usage

The server provides one tool:

generate_test_image

Generate a test image with specified parameters.

Parameters:

• width (number): Width of the image in pixels (1-4096)

• height (number): Height of the image in pixels (1-4096)

• color (string): Color of the image as hex code (e.g., #FF0000 or #f00)

• filepath (string): Full path where the PNG image should be saved

• label (string, optional): Custom text to display in the top-left corner of the image

Example:

{
  "name": "generate_test_image",
  "arguments": {
    "width": 400,
    "height": 300,
    "color": "#3498db",
    "filepath": "/tmp/test_image.png",
    "label": "My Custom Label"
  }
}

Returns:

• Text confirmation that the image was successfully generated and saved

Color Format

The tool supports hex color format:

• Hex colors: #FF0000, #f00

Testing

Run the test script to verify the server works:

npm run build
npm test

Dependencies

• Node.js canvas library for image generation

• Model Context Protocol SDK

Notes

• Maximum image dimensions are capped at 4096x4096 pixels for performance

• Generated images include dimension text overlay for easy identification

• Text color is automatically chosen for optimal contrast against the background

• The server automatically creates directories if they don't exist in the specified file path

Contributing

Feel free to submit issues and enhancement requests!