Flashlight

PImage img;

​

void setup() {

  size(1032, 774);

  img = loadImage("fuschlsee.jpg");

}

​

void draw() {

 // image(fuschlsee, 0, 0);

  loadPixels(); 

  img.loadPixels();

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

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

      int loc = x+y*width; 

      float r = red(img.pixels[loc]);

      float g = green(img.pixels[loc]); 

      float b = blue(img.pixels[loc]); 

      float d = dist(mouseX, mouseY, x, y);

      float factor = map(d, 0, 200, 2, 0);

      pixels[loc] = color(g*factor, r*factor, b*factor); 

   }

  }

  updatePixels(); 

}