hi
i am trying to get processing to read an image in terms of black and white and if the pixel is black / white draw something in place of that black / white pixel.
i have got to a point where i THINK it is doing that but i dont want the image to be seen behind what i am drawing.
is there any way to do this?
here is my code so far....

PImage polarfleece;
void setup (){
size (600,600);
polarfleece =loadImage("polarfleece.JPG");
image(polarfleece, 0, 0);
filter(GRAY);
filter(POSTERIZE, 2);


}  
 
void draw ()
{  
   polarfleece.loadPixels ();  
   for (int x = 0; x< polarfleece.width; x++)  
   {  
  for (int y=0; y< polarfleece.height; y++)  
  {  
 int i = (y * polarfleece.width + x);  
 if (polarfleece.pixels [i] == color(255) ) {  
ellipse (x,y,40,40) ;  
 }  
 else if (polarfleece.pixels [i] == color(256) ) {  
 }  
  }  
   }  
}

any help would be greatly appreciated
thanks