// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 15-7: Displaying the pixels of an image
  
  PImage img;
  
  void setup() {
    size(200,200);
    img = loadImage("sunflower.jpg");
  }
  
  void draw() {
    loadPixels();
  
    // We must also call loadPixels() on the PImage since we are going to read its pixels.
    img.loadPixels();
    for (int y = 0; y < height; y++ ) {
      for (int x = 0; x < width; x++ ) {
        int loc = x + y*width;
        // The functions red(), green(), and blue() pull out the three color components from a pixel.
        float r = red(img.pixels [loc]); 
        float g = green(img.pixels[loc]);
        float b = blue(img.pixels[loc]);
  
        // Image Processing would go here
        // If we were to change the RGB values, we would do it here, before setting the pixel in the display window.
  
        // Set the display pixel to the image pixel
        pixels[loc] = color(r,g,b);
      }
    }
    
    updatePixels();
  }