You can shoot 200 ASA negative film at 100 ASA and barely tell the difference. Slide film would be noticably light and washed out. As a general rule, over-exposing film is better than underexposing. Underexposing will reveal the grain while overexposing will reduce the grain. Photo Paper One of the important parts of the arcane art of printing film is the paper.
Paper is available in a variety of contrasts.
Some papers will reduce or expand the contrast. Typical film printers will only stock medium contrast papers. Printing Quality I have rarely ever been pleased with the quality of printed pictures. The colors are rarely consistant. That is why I only scan the negatives.