PImage img;

void setup() {
  size(500, 500);
  img = loadImage("data/coldplay.jpg");
  img.resize(500, 500);
  textSize(32);
  colorMode(HSB);
}

float t = 0;
float dt = 1;

void draw() {
    img.loadPixels();
  float div = 32.0;
  background(255);
  for (int x = 0; x < img.width; x++) {
    for (int y = 0; y < img.height; y++) {
      int idx = x + y * img.height;
      color col = img.pixels[idx];
      if (brightness(img.pixels[idx]) < 100) {
        point(x, y);
      }
    }
  }
  t += dt;
}