Generating Photos with Code 程式生成照片

By Yiler Huang

// import the JIMP library
 
const Jimp = require("jimp");
 
 
const fs = require('fs');
 
 
// knuth shuffle from https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array
//shuffle
function shuffle(array) {
    var currentIndex = array.length,
        randomIndex;
    // While there remain elements to shuffle...
    while (currentIndex != 0) {
        // Pick a remaining element...
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex--;
        // And swap it with the current element.
        [array[currentIndex], array[randomIndex]] = [
            array[randomIndex], array[currentIndex]
        ];
    }
    return array;
}
 
//randomRange
function randomRange(min, max) {
    return min + ((max - min) * Math.random())
}
 
 
//pickFromArray
function pickFromArray(array) {
    return array[Math.floor(Math.random() * array.length)];
}
 
//from https://jeremyresearch.medium.com/node-js-count-the-numbers-of-files-in-a-directory-9562dec64a45
// set the path data in an array
 
let pathArray = [
    "pics/input1.jpg",
    "pics/input2.jpg",
    "pics/input3.jpg",
    "pics/input4.jpg",
    "pics/input5.jpg",
    "pics/input6.jpg",
    "pics/input7.jpg",
    "pics/input8.jpg",
];
 
 
function trueOrFalse() {
    let output = Math.random() < 0.5 ? true : false;
    return output
}
 
// use map to read the path data and produce JIMP Promises
 
let newPA = shuffle(pathArray).slice(0, 3)
let jimpData = newPA.map(path => Jimp.read(path));
 
 
 
// through Promise.all, get the data from the Promises and process it through the methods provided by JIMP
// the data processing will proceed in parallel, just as it does in Hydra
 
for (let i = 0; i < 50; i++) {
    Promise.all(jimpData).then((pictures) => {
        return pictures[0]
            .grayscale()
            //composite argument1: shiftX, argument2: shiftY
            .composite(pictures[1].color([{
                apply: "tint",
                params: [randomRange(0, 30)]
            }]).mirror(trueOrFalse(), trueOrFalse()), 0, 0, {
                mode: Jimp.BLEND_LIGHTEN,
                opacitySource: 1
            })
            .composite(pictures[2].grayscale().dither565().dither565(), 0,0, {
                mode:Jimp.BLEND_DARKEN,
                opacitySource: 0.6
            })
            .color([{
                apply: "hue",
                params: [randomRange(-360, 360)]
            }])
            .resize(2000, 2000)
            .write(`./output-3/output-${i}.jpg`);
    }).catch((err) => {
        console.error(err)
    })
    newPA = shuffle(pathArray).slice(0, 2)
    jimpData = newPA.map(path => Jimp.read(path));
 
}

// import the JIMP library

const Jimp = require("jimp");


const fs = require('fs');


// knuth shuffle from https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array
//shuffle
function shuffle(array) {
    var currentIndex = array.length,
        randomIndex;
    // While there remain elements to shuffle...
    while (currentIndex != 0) {
        // Pick a remaining element...
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex--;
        // And swap it with the current element.
        [array[currentIndex], array[randomIndex]] = [
            array[randomIndex], array[currentIndex]
        ];
    }
    return array;
}

//randomRange
function randomRange(min, max) {
    return min + ((max - min) * Math.random())
}


//pickFromArray
function pickFromArray(array) {
    return array[Math.floor(Math.random() * array.length)];
}

//from https://jeremyresearch.medium.com/node-js-count-the-numbers-of-files-in-a-directory-9562dec64a45
// set the path data in an array

let pathArray = [
    "pics/input1.jpg",
    "pics/input2.jpg",
    "pics/input3.jpg",
    "pics/input4.jpg",
    "pics/input5.jpg",
    "pics/input6.jpg",
    "pics/input7.jpg",
    "pics/input8.jpg",
    "pics/input9.jpg",
    "pics/input10.jpg",
    "pics/input11.jpg",
    "pics/input12.jpg",
];


function trueOrFalse() {
    let output = Math.random() < 0.5 ? true : false;
    return output
}

// use map to read the path data and produce JIMP Promises

let newPA = shuffle(pathArray).slice(0, 3)


let jimpData = newPA.map(path => Jimp.read(path));



// through Promise.all, get the data from the Promises and process it through the methods provided by JIMP
// the data processing will proceed in parallel, just as it does in Hydra

for (let i = 0; i < 100; i++) {
    Promise.all(jimpData).then((pictures) => {
        return pictures[0]
            .grayscale()
            //composite argument1: shiftX, argument2: shiftY
            .composite(pictures[1].grayscale().invert(), 0,0, {
                mode:Jimp.BLEND_DARKEN,
                opacitySource: 0.8
            })
            .composite(pictures[2].color([{
                apply: "tint",
                params: [randomRange(0, 30)]
            }]).mirror(trueOrFalse(), trueOrFalse()), 0, 0, {
                mode: Jimp.BLEND_LIGHTEN,
                opacitySource: 1
            })
            .color([{
                apply: "hue",
                params: [randomRange(-360, 360)]
            }])
            .resize(2000, 2000)
            .write(`./output-5/output-${i}.jpg`);
    }).catch((err) => {
        console.error(err)
    })
    newPA = shuffle(pathArray).slice(0, 3)
    jimpData = newPA.map(path => Jimp.read(path));

}