let img;

function preload() {
  img = loadImage('assets/rockies.jpg');
}

function setup() {
  background(img);
  copy(img, 7, 22, 10, 10, 35, 25, 50, 50);
  stroke(255);
  noFill();
  // Rectangle shows area being copied
  rect(7, 22, 10, 10);
}