Having gained experience through directing television commercials and industrial films for their Pittsburgh-based production company The Latent Image, Romero and his friends Russo and Russell Streiner decided to fulfil their ambitions to make a feature film. Electing to make a horror film that would capitalize on contemporary commercial interest in the genre, they formed a partnership with Karl Hardman and Marilyn Eastman of Hardman Associates called Image Ten. After evolving through multiple drafts, Russo and Romero's final script primarily drew influence from Richard Matheson's 1954 novel "I Am Legend". Principal photography took place between June and December 1967, primarily on location in Evans City; aside from the Image Ten team themselves, the cast and crew consisted of their friends and relatives, local stage and amateur actors, and residents from the area. Although the film was his directorial debut, Romero utilized many of the guerrilla filmmaking techniques he had honed in his commercial and industrial work to complete the film on a budget of .