createCanvas(400, 400);

  pixelDensity(1);

}

​

function draw() {

  loadPixels();

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

    pixels[i] = 255;

    pixels[i + 1] = 0;

    pixels[i + 2] = 0;

    pixels[i + 3] = 255;

  }

  updatePixels();

}

​