dots

PImage img;
int step=25, num=5, counter;

void setup() {
  img = loadImage("http://www.cnsnews.com/sites/default/files/images/freeman%20%202_1.jpg");
  size(img.width, img.height);
  colorMode(HSB, 360, 100, 100);
  background(#eeeeee);
  noStroke();
  for (int y=step/2; y<height; y+=step) {
    for (int x=step/2; x<width-step; x+=step) {
      float offSet=counter%2==0?0:step/2;
      for (int i=0; i<num; i++) {
        float dv = map(i, 0, num-1, -3, 3);
        float sz = map(i, 0, num, step*1.2, step/2);
        color col = img.get(int(x+dv+offSet), int(y+dv));
        float h = hue(col);
        float s = saturation(col);
        float b = brightness(col);
        fill(h, s, b);
        float scal=map(b, 0, 255, 1, 0);
        ellipse(x+offSet, y, sz*scal, sz*scal);
      }
    }
    counter++;
  }
}

void draw() {
}

void keyPressed() {
  save(random(3234)+".jpg");
}