disco

PImage img;
int f, step = 4;

void setup() {
  img = loadImage("tmp-0.gif");
  size(img.width, img.height);
  background(0);
  stroke(255);
  colorMode(HSB, 255, 100, 100);
  rectMode(CENTER);
  frameRate(10);
}

void draw() {
  if (frameCount==172) noLoop();
  convPic();
}

void convPic() {
  background(#000000);
  img = loadImage("tmp-"+((frameCount-1)%172)+".gif");
  for (int x=2; x<width; x += step) {
    for (int y=2; y<height; y+= step) {
      f = (int) map(y, 0, height, 0, 255);
      color col = img.get(x, y);
      if (brightness(col)<80) {
        fill(f, 100, 100);
      } else {
        fill(#2F065A);
      }
      stroke(#000000);
      rect(x, y, step, step);
    }
  }
  saveFrame("image-###.gif");
}