PNG Image Retention and Vectorization

To achieve retention in a PNG image (i.e., preserve transparency), you can use the pngjs library, which provides an encoder/decoder for PNG images.

Here's a brief example:

const pngjs = require('pngjs');

// Create a new PNG buffer
const pngBuffer = pngjs.createPNG({
  width: 100,
  height: 100,
  bitDepth: 8,
});

// Add some transparent pixels
pngBuffer.data[4] = 0; // alpha channel index

// Encode the PNG image
const encodedPng = pngjs.encode(pngBuffer);

// Save the encoded PNG to a file (optional)
encodedPng.pipe(process.stdout);

For vectorization, you can use libraries like svg.js or vectorizer. However, these libraries are not directly related to PNG images.

If you're looking for a solution that combines retention and vectorization, you may need to explore more advanced techniques, such as using a graphics editor or a dedicated image processing library.