The document analyzes the conventions used in horror film posters through examples of posters for The Woman in Black and Sweeney Todd. Key conventions discussed include using dark colors and mysterious fonts to set a scary tone, including frightening background images, featuring prominent actors to attract audiences, and using short taglines and titles to hint at the films' frightening plots without revealing too much. Overall, the document examines how horror movie posters employ visual and textual elements to subtly promote the films' scary themes and storylines.