createCanvas(200, 200);

  pixelDensity(1);

}

​

function draw() {

  loadPixels();

  let pixelIndex,

      brightness,

      xOffset,

      yOffset = 0;

  for (let x = 0; x < width; x++) {

    xOffset = 0;

    for (let y = 0; y < height; y++) {

      pixelIndex = (x + y * width) * 4;

      brightness = noise(xOffset, yOffset) * 255;

      pixels[pixelIndex] = brightness;

      pixels[pixelIndex + 1] = brightness;

      pixels[pixelIndex + 2] = brightness;

      pixels[pixelIndex + 3] = 255;

      xOffset += 0.05;

    }

    yOffset += 0.05;

  }

  updatePixels();

}

​