​

function setup() {

  createCanvas(400, 400);

  background(220);

  pixelDensity(1);

  loadPixels();

  print(pixels.length);

  // why is pixels.length 640,000?

  // it's 400 * 400 * 4

  // width * height * [r,g,b,a] for each pixel

  // pixel array is collapsed to one dimension

}

​

​

​

​

​