bounce

PImage img;
int slices = 10;
float unit, theta;

void setup() {
  img = loadImage("pic1.jpg");
  size(img.width, img.height);
  unit=height/slices;
}

void draw() {
  image(img, 0, 0);
  for (int i=0; i<slices; i++) {
    float scal = map(sin(theta),-1,1,1,1.3);
    int y = int(i*unit);
    copy(img,0,y,width,int(unit),0,y,width, int(unit*scal));
  }
  theta += TWO_PI/slices;

  //if (frameCount<11) saveFrame("image-####.gif");

}