public Void doInBackground(){

			int xmin=0;
			int xmax=0;

			for(int i = 0; i < worker.size(); i++){
		        if(this == worker.get(i)){
		                xmin=i*width/WMAX;
		                xmax=(i+1)*width/WMAX;
		        }
		}


			int escapeIters;
			for(int bsize=64; bsize>0; bsize=bsize/2){
				for (int x=xmin; x<xmax; x+=bsize) {
		            for (int y=0; y<height; y+=bsize) {
		               CDouble c = getPointJittered(x, y, 0.1);
		               //iters[x*height + y] = getEscapeIters(c);
		               escapeIters=getEscapeIters(c);

		               for(int i = x; i<xmax && i<x+bsize; i++){
		            	   for(int j = y; j<height && j<y+bsize; j++){
		            		 iters[i*height + j] = escapeIters;
		            	   }
		               }

		            }
		        }
				  publish();
			}

			return null;
		}