
Gamma 23
Luminance is proportional to inten-
sity. For an introduction to the
terms
brightness, intensity, lumi-
nance,
and
lightness,
see page 11.
Electro-optical transfer function
(EOTF) refers to the transfer func-
tion of the device that converts
from the electrical domain of
video into light- a display.
In photography, video, and computer graphics, the
gamma
symbol, y, represents a numerical parameter
that describes the nonlinearity of luminance reproduc-
tion. Gamma is a mysterious and confusing subject,
because it involves concepts from four disciplines:
physics, perception, photography, and video. This ...