README

png2teletext

This is a CLI application for converting images to teletext level 1 compatible data. Starting from the upper leftmost, the algorithm goes by 2x3 blocks of pixels, and translates them to teletext mosaic charachters. It can also be used as a Node.js library.

poes

It handles images of any dimensions, they don't have to be within the constraints of a standard teletext page.

Requirements

node v8 or older (It probably works with older versions as well, but I haven't tested it on anything older than v8.9.0.)
npm v5 or older (It comes with node.)

Installation

This module is distributed via both npm and yarn.

$ npm install png2teletext --g

Command line example

$ png2teletext ./test/test.png --out teletextData.bin

Using it as a Node.js library

const png2teletext = require('png2teletext');
const { PNG } = require('pngjs');
const fs = require('fs');

const data = fs.readFileSync('./test/test.png');
const png = PNG.sync.read(data);
const teletextData = png2teletext(png.data, png.width);

console.log(teletextData);

This code is released under the MIT license, feel free to do whatever you want with it.