ABSTRACT
The key element of the Zone System is a “visual ruler” that allows both film and digital photographers to visualize and actually measure the difference between normal-, low-, and high-contrast subjects. Instead of having to visualize the specific value of each zone, photographer can instead look at a given object and safely assume that its tones will fall somewhere within the range of a given zone. Zones that have no texture and detail that are used to represent extremely dark or pure white objects in a photograph. Photographs printed from film negatives are analog and effectively create the illusion of an infinite number of shades of gray. Zones represent amounts of light that double as the zones become lighter and halve as they get darker. In this sense, zones are equivalent to all other photographic controls.
