Glitch di un'immagine con Processing

sketch_170923a.pde

/*
 * Glitch di un'immagine con Processing
 * Federico Pepe, 23.09.2017
 * http://blog.federicopepe.com/processing
 */

PImage img;
int minThreshold = 200;
int maxThreshold = 255;

void setup() {
  size(1, 1);
  surface.setResizable(true);
  img = loadImage("fire.jpg");
  surface.setSize(img.width, img.height);  

  noStroke();
  noLoop();
}

void draw() {
  background(255);
  image(img, 0, 0);
  img.loadPixels();

  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {

      if (brightness(img.pixels[y*width+x]) > minThreshold && brightness(img.pixels[y*width+x]) < maxThreshold) {
        color c = get(x, y);
        stroke(c);
        line(x, y, x, y+2);
        noFill();
      }
    }
  }
}

void mousePressed() {
  save("export/export.png");
}