Blow-Up is a 1966 British-Italian film directed by Michelangelo Antonioni and starring David Hemmings, Vanessa Redgrave, and Sarah Miles. The film is based on a short story by Argentinian writer Julio Cortรกzar, titled "Las babas del diablo" (The Devil's Drool).
The film follows the character of Thomas, a mod photographer in London who is bored with his life and feels unfulfilled by his work, despite his success. One day, he wanders into a park and takes photos of a couple embracing, but later realizes that he may have accidentally captured evidence of a murder.
As he studies the photographs more closely, he becomes convinced that he has indeed caught a crime on camera. However, when he tries to report it to the authorities, he finds that he has no physical evidence and no witnesses to back up his claim.
Throughout the film, Thomas becomes increasingly obsessed with the idea of having witnessed a murder, and his own photographic work takes on a new significance as he struggles to find meaning in his life and work. Meanwhile, his hedonistic lifestyle begins to spiral out of control, as he becomes embroiled in a series of bizarre and surreal encounters.
Blow-Up is considered a seminal work of 1960s cinema, and is particularly noted for its innovative cinematography and editing techniques. It is also credited with helping to popularize the mod style and culture that was emerging at the time. The film won the Palme d'Or at the 1967 Cannes Film Festival, and has had a lasting impact on the world of film and popular culture.