I'm not really used to use the get() function and I'm having some trouble with it. I want the program to do something in particular when it finds a pixel with a different colour than the background, but the function, for some reason, returns color 0 with a white background,around the edges of the window. I know that the image I use is completely white except for a black A in the middle, and I've tested it with a black rectangle (generated by processing) and got the same result. This is the code, thanks!:

2. size(500,500);
3. int back=255;
4. background(255);
5. PImage test;
6. test=loadImage("test.png");
7. image(test,0,0);
8. rect(200,300,100,100);
9. for(int x=0;x<width;x++){
10.   for(int y=0;x<height;y++){
11.     colcur=get(x,y);
12.     println (colcur);
13.     if(colcur!=-1){
14.       println(colcur);
15.       stroke(255,0,0);
16.       line(x,0,x,height);
17.       break;
18.     }
19.   }
20.   if(colcur!=-1) break;
21. }