I agree with hrst. People do need to understand there is a loss of quality scanning from negatives or transparencies for display on a computer, which kind of defeats the purpose of why you would be using film as your media at all: you'd be much happier with digital. Some posts here, though, are befuddling: shooting slides, no scanning, no printing. And...!?
Ilfochromes are the way to go when shooting slides, not scanning and displaying on computers, and certainly not degrading digital prints; the loss of quality will be too obvious and no about of Photochopping will bring it back without introducing artifice.
All Ilfochromes require contrast masking. Dodging/burning is at the discretion of printer+photographer at dialogue stage (in-lab), or for very obvious areas.
Velvia 50 is most prone to blocked shadows but blows highlights gracefully; Velvia 100 is slightly better at EI80 while Provia 100F is relatively easy going printing to 'chromes — it really is a delight.