let shape;

let img;

​

function preload() {

  img = loadImage("0.jpg");

}

​

function setup() {

  createCanvas(600, 600);

  shape = createGraphics(width, height);

}

​

function draw() {

  tint(255, 0, 0, 125);

  image(img, 0, 0, width, height);

​

  tint(255, 255);

  shape.ellipse(random(width), random(height), 100, 100);

  //image(shape, 0, 0);

  img.mask(shape);

  image(img, 0, 0, width, height);

}

​

function mousePressed() {}

​