atkinson

Node v22.

$ npm -g i atkinson
$ atkinson file.jpg > 1.png

index.js contains a function that takes an ImageData object & modifies it in-place.

$ npm i atkinson

then

import {dithering} from 'atkinson'

let imagedata = ctx.getImageData(0, 0, img.width, img.height)
ctx.putImageData(dithering(imagedata), 0, 0)

♲ Loicense

MIT