Stealth Watermark Reader

A wasm pack for reading stealth watermark embedded in pictures' alpha channel, interpreted from NovelAI's GitHub repo.

Installation

npm install stealth-watermark-reader

Usage

Below is an example of how to decode embedded information from an image with a specified path:

import init, { decode_image_data } from 'stealth-watermark-reader';

// Initialize the WASM module only once
await init();

try {
    const response = await fetch('path/to/image.png');
    const imageBuffer = await response.arrayBuffer();
    const result = await decode_image_data(new Uint8Array(imageBuffer));
    console.log(result);
} catch (error) {
    console.error('Failed to decode watermark:', error);
}

API Reference

• decode_image_data(imageBytes: Uint8Array): string
  • Parameters:
    • imageBytes - A Uint8Array containing the bytes of the image.
  • Returns: A string containing the decoded information.
  • Throws: An error if the watermark cannot be decoded.

Supported Image Formats

The function works for all formats of images with an alpha channel (e.g., .png, .webp), as long as Rust's image library can decode them.