README.md

Netpbm

Web viewer and converter for Netpbm files: .pbm, .pgm, .ppm (P1 - P6)

• ppm-converter (library): npm install @cs101/ppm-converter
• ppm-viewer: npm run build to build with webpack
  • Demo (with image)
  • Demo (with upload)

PPM Converter (Web)

import { PpmImage } from "@cs101/ppm-converter";

const imageConverter = new PpmImage(data); // data = byte string

imageConverter.getCanvas() // returns a canvas displaying the PPM file
imageConverter.getPNG()    // returns a b64 DataURI of a PNG

PPM Converter (NodeJS/Sharp)

import { PpmImage } from "@cs101/ppm-converter-sharp";

const imageConverter = new PpmImage(data); // data = Uint8Array

const image = imageConverter.getImage() // returns a sharp image

await image.toFile("image.png");

Credits:

Inspiration taken from:

• http://paulcuth.me.uk/netpbm-viewer
• https://en.wikipedia.org/wiki/Netpbm
• http://fejlesztek.hu/pbm-p4-image-file-format/ (to implement P1 and P4 correctly)