It’s not often that a doc about the transformative power of cinema will deliberately use bad clips of the movies it’s talking about, but that’s part of the point of this insightful, sprawling film, corralled by director David Hinton. Though the masterpieces made by Michael Powell and Emeric Pressburger at the height of their big-screen, Technicolor powers were visually impeccable, their subversive emotional power could still pack a punch through a 16-inch TV screen, even from the most scratched, butchered, and washed-out black-and-white prints.