2. PImage img;
3. 
   
4. void setup () {
5.   size(60, 60);
6.   img = loadImage("aaa.png");
7. }
8. 
   
9. void draw () {
10.   int count = 0;
11.   loadPixels();
12.   // Since we are going to access the image's pixels too;
13.   img.loadPixels();
14.   for (int y = 0; y < height; y++) {
15.     for (int x = 0; x < width; x++) {
16.       int loc = x + y * width;
17.       
18. ////////////////////////////////////////////////////////////////
19.       count++;
20.       println(count);
21. ////////////////////////////////////////////////////////////////      
22. 
    
23.       // Image Processing Algorithm would go here
24.       float r = red  (img.pixels[loc]);
25.       float g = green(img.pixels[loc]);
26.       float b = blue (img.pixels[loc]);
27.     
28.       // Image Processing would go here
29.     
30.       // Set the display pixel to the image pixel
31.       pixels[loc] = color(r, g, b);
32.     }
33.   }
34.   updatePixels();
35. }

And I guess the reason is line 19 and 20 which lead to more calculate. But if even this simple calculate can not undertake, how can I do other complex image processing? Cause I believe Processing is powerful, so can anyone points out where goes wrong that I do not know? Thanks first.