For his historical drama “Moulin,” which premieres in competition at the Cannes Film Festival , Oscar-winning Hungarian filmmaker László Nemes (“Son of Saul”) traveled back in time to WWII-era France to tell the story of Jean Moulin, a resistance fighter whose bravery helped liberate his country from Nazi occupation. When it came to the exacting work of putting the finishing touches on the film, however, Nemes chose to stay closer to home. As with his previous film, “Orphan,” which premiered last year in Venice, Nemes did post-production work at Budapest’s NFI Filmlab, where the director and the creative team behind “Moulin” — which was shot on 35mm by cinematographer Mátyás Erdély — processed nearly 200,000 feet of film stock using the lab’s new processing machines and developed negatives using innovative bleach bypass technology.…