​

function setup() {

  createCanvas(300, 300);

  img = loadImage("https://happycoding.io/images/stanley-1.jpg");

}

​

function draw() {

  // Get a random position in the image

  let x = floor(random(img.width));

  let y = floor(random(img.height));

​

  // Set that pixel to black

  let black = color(0);

  img.loadPixels();

  img.set(x, y, black);

  img.updatePixels();

​

  image(img, 0, 0);

}