PImage puter, library, dino;

void setup(){
  size(640,517);
  puter = loadImage("puter.png");
  library = loadImage("library.png");
  dino = loadImage("dino.png");
}

void draw(){
  dino.blend(library, 0,0,600,500,0,0,600,500,LIGHTEST);
  dino.blend(puter,0,0,600,500,0,0,600,500,DARKEST);
  image(dino,0,0);

}