gistfile1.txt

int count = 0;
int position = 1;
PImage sky;

void setup() {
  fullScreen();
  //size(800,600);
  frameRate(20);
}
void draw() {
  count++;

  if (count > 36) {
    sky = loadImage("img.jpg");

    //image(sky, 0, (height/4*position)-height/4);
    PImage crop = sky.get(0,0,width,height/24);
    image(crop, 0, (height/24*position)-height/24);

    position++;
    if (position > 24) {
      position = 1;
    }
    count = 0;
  }
}