function preload(){

  img = loadImage("land.jpg");

}

​

function setup() {

  createCanvas(400, 400);

  stroke(255);

}

​

function draw() {

  // image(img,0,0,width,height);

  set(0, 0, img); // set() replaces every pixel on the canvas with pixels of img

  let c = get(mouseX, mouseY); // get() grabs the color of the pixel right underneath the cursor and store it inside c

  fill(c);

  rect(50,50,50,50);

  updatePixels(); 

}