I have been using this code to make a sort trail that follows my mouse. The only thing is I want to have it blurred so it looks more like a multi-coloured light trail.


 for(int i=0; i<num; i++) {
   
   fill (random(255), random(255), random(255));
   fill (alpha(255), alpha(255), alpha(255));
   fill((random(100, 255) / num) * i, (random(100, 255) / num) * i, (random(100, 255) / num) * i, (255 / num) * i);
   ellipse(mx[i], my[i], i/2, i/2);
   noStroke();
 
   }

I attempted to use the blur filter but it applied it to the rest of the screen and slowed it all down. Any ideas?

Thanks