Sepia toning is a chemical process used in photography which changes the appearance of black-and-white prints to brown. The color is now often associated with antique photographs. Most photo graphics software programs and many digital cameras include a sepia tone filter to mimic the appearance of sepia-toned prints. Acclaimed Russian director Andrei Tarkovsky used a sepia tone in his 1979 science-fiction film Stalker to visually distinguish scenes set in the forbidden Zone from the real world, which is generally portrayed in black and white.