Which of these Hitchcock films was filmed only in black and white?

Psycho is a 1960 American psychological horror film directed and produced by Alfred Hitchcock, and written by Joseph Stefano, starring Anthony Perkins, Janet Leigh, John Gavin, Vera Miles and Martin Balsam. It was based on the 1959 novel of the same name by Robert Bloch. The film centers on the encounter between a secretary, Marion Crane (Leigh), who ends up at a secluded motel after stealing money from her employer, and the motel's disturbed owner-manager, Norman Bates (Perkins), and its aftermath.

When originally made, the film was seen as a departure from Hitchcock's previous film North by Northwest, having been filmed on a low budget, with a television crew and in black and white. Psycho initially received mixed reviews, but outstanding box office returns. This prompted reconsideration which led to overwhelming critical acclaim and four Academy Award nominations, including Best Supporting Actress for Leigh and Best Director for Hitchcock.

Hitchcock offered to film Psycho quickly and inexpensively in black and white using his Alfred Hitchcock Presents television series crew which Paramount executives rejected. Hitchcock countered he would personally finance the project and film it at Universal-International using his Shamley Productions crew if Paramount would merely distribute. In lieu of his usual $250,000 director's fee he proposed a 60% stake in the film negative. This combined offer was accepted and Hitchcock went ahead with the production.