Cycles the Hue of Andy Warhol's Marilyn Monroe Screen Print

WarholMarilynHueCycle.pde

PImage img;
int hueOffset = 0;

void setup() {
  img = loadImage("warholMarilyn.jpg");
  surface.setSize(img.width, img.height);  
  colorMode(HSB);
}

void draw() {
  loadPixels();
  for (int i = 0; i < pixels.length; i++) {    
    int h = ((int) hue(img.pixels[i]) + hueOffset) % 256;
    pixels[i] = color(h, saturation(img.pixels[i]), brightness(img.pixels[i]));
  }
  updatePixels();

  hueOffset = (hueOffset + 1) % 256;
}