/* Load a gif or png image with transparency and create
 * a collage by layering the image
 */
 
PImage img = loadImage("bill.jpg");

float x = 0;
float y = 0;
float step = 1.2;

float initPercentage = 0.1;

float w;
float h;

for (float p = initPercentage; y < height; p*=step) {
   w = img.width;
   h = img.height;
   for (x = -w/2; x < width; x+=w/2) {
     image(img, x, y, w, h);
   }
}