Hi,
I'm reading that if I rate portra or fuji pro at 200 my negatives will just become denser and I get a more saturated look. To achieve that, do I tell the lab to develop for 200iso or will that undo what I'm trying to achieve?
Same thing goes for when I shoot it at 1600. How will the look change if I have it developed at 1600 or standard?

Thanks a lot!