The opening sequence of Sweeney Todd establishes the dark, gloomy setting through its use of color, lighting, and props. Dark colors like black and red are prominently featured. The old, run-down building shown appears dark and ominous. Unsettling images like blood and implied violence further a sense of danger and mystery. The tense, ominous music builds a feeling of impending threat. All of these elements combine to strongly suggest to the audience that this will be a horror film.