
ISO 5-1,
Photography-Density
measurements- Terms, symbols,
and notations.
See also parts 2
through 4.
SMPTE 180M,
File Format for Digital
Moving-Picture Exchange (DPX).
When two stimuli differ by
1 JND, 75% of guesses will be
right and 25% will be wrong.
Stevens, S.S.,
Psychophysics
(New York: Wiley, 1975).
In transmissive film media,
transmittance
(3) is the frac-
tion of light transmitted through the medium. Transmit-
tance is usually measured in logarithmic units:
Optical
density -
or
just
density - is
the negative of the loga-
rithm of transmittance. (Equivalently, optical density is
the logarithm of incident ...