How is contrast calculated?
Contrast ratio is calculated in many different ways. The basic idea is to make one part of the screen dark and one part really bright and measure the difference using a light meter. Among the best known is the “full on/full off” method. There is also ANSI, which was developed as a way of measuring the contrast in projectors. Another commonly used method is the VESA (Video Electronics Standards Association) Flat Panel Display Measurement (FPDM) standard. And in Japan, the JEITIA (Japan Electronics and Information Technology Industries Association) rules the roost.
