The low-key lighting schemes of many classic film noirs are associated with stark light/dark contrasts and dramatic shadow patterning—a style known as chiaroscuro. The shadows of Venetian blinds or banister rods, cast upon an actor, a wall, or an entire set, are an iconic visual in noir and had already become a cliché well before the neo-noir era. Characters' faces may be partially or wholly obscured by darkness—a relative rarity in conventional Hollywood moviemaking. While black-and-white cinematography is considered by many to be one of the essential attributes of classic noir, the color films Leave Her to Heaven (1945) and Niagara (1953) are routinely included in noir filmographies, while Slightly Scarlet (1956), Party Girl (1958), and Vertigo (1958) are classified as noir by varying numbers of critics.
Film noir is also known for its use of low-angle, wide-angle, and skewed, or Dutch angle shots. Other devices of disorientation relatively common in film noir include shots of people reflected in one or more mirrors, shots through curved or frosted glass or other distorting objects (such as during the strangulation scene in Strangers on a Train), and special effects sequences of a sometimes bizarre nature. Night-for-night shooting, as opposed to the Hollywood norm of day-for-night, was often employed. From the mid-1940s forward, location shooting became increasingly frequent in noir.
