sure nobody understands what you mean...
could you show an example of the effect ?

sure:




it looks like removing background(x); from the draw order, with the difference that the image fades out slowly.

still not 100% sure what the wanted effect is.
But if it is the ghosting...
it is done like this :


/*
*
*/

void setup() {
  size(600,400);
  smooth();
 background(0);
 noStroke();

}

void draw() {
  fill(0,10);
  rect(0,0,width,height);
  fill(255);
  ellipse(mouseX,mouseY,40,40);



}


 

perfect! you got it.

thanks a lot!!!