photon rust 图像处理库

{

  "name": "image-demo",

  "version": "1.0.0",

  "main": "index.js",

  "license": "MIT",

  "dependencies": {

    "@silvia-odwyer/photon-node": "^0.3.3"

  }

}

var fs = require('fs');

var photon = require("@silvia-odwyer/photon-node");

function grayscaleImage() {

    // read file, then convert to base64

    var base64 = fs.readFileSync(`input.png`, { encoding: 'base64' });

    let data = base64.replace(/^data:image\/(png|jpg);base64,/, "");

    // convert base64 to PhotonImage

    var phtn_img = photon.PhotonImage.new_from_base64(data);

    photon.grayscale(phtn_img);

    // get base64 from filtered image, and write 

    let output_base64 = phtn_img.get_base64();

    let output_image_name = "output.png";

    var output_data = output_base64.replace(/^data:image\/\w+;base64,/, '');

    fs.writeFile(output_image_name, output_data, {encoding: 'base64'}, function(err) {

    });

    console.log(`Saved ${output_image_name}`);

}

grayscaleImage();