function preload() {

  img = loadImage("beach.jpg");

}

function setup() {

  createCanvas(img.width, img.height);

  let gfx = createGraphics(img.width, img.height);

  img.loadPixels();

  gfx.loadPixels();

  for (let i = 0; i < img.pixels.length; i+=4) {

    gfx.pixels[i] = img.pixels[i];

    gfx.pixels[i+1] = img.pixels[i+1];

    gfx.pixels[i+2] = img.pixels[i+2];

    gfx.pixels[i+3] = img.pixels[i+3];

    if (random() > 0.9) {

      let j = i;

    gfx.pixels[j] = 255;

    gfx.pixels[j+1] = 255;

    gfx.pixels[j+2] = 255;

    gfx.pixels[j+3] = 255;

    }

  }

  gfx.updatePixels();

  image(gfx,0,0);

  console.log("done");

  noLoop();

}

​

function draw() {

  // background(220);

}