​

​

function setup()

{

  createCanvas(256, 256);

  noLoop();

  GenerateWhiteNoise(width, height);

  image(noiseImage, 0, 0);

}

​

​

function GenerateWhiteNoise(w, h)

{

  noiseImage = createGraphics(w, h);

  noiseImage.loadPixels();

  let pixels = noiseImage.pixels;

  for (let x = 0; x < w; ++x)

  {

    for (let y = 0; y < h; ++y)

    {

      let gray = ComputeGray(x, y);

      let p = 4 * (w * y + x);

      pixels[p + 0] = gray;

      pixels[p + 1] = gray;

      pixels[p + 2] = gray;

      pixels[p + 3] = 255;

    }

  }

  noiseImage.updatePixels();

}

​

​

function ComputeGray(pixelX, pixelY)

{

  return pow(random(1.0), 1) * 255;

}

​