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Digital Video and HD
book

Digital Video and HD

by Charles Poynton
January 2003
Intermediate to advanced content levelIntermediate to advanced
736 pages
30h 54m
English
Morgan Kaufmann
Content preview from Digital Video and HD
Figure 20.2
Luminance and lightness.
The dependence of lightness (L*) or value (V) upon rela-
tive luminance (Y) has been modeled by polynomials, power functions, and logarithms. In all of
these systems, 18% "mid-gray" has lightness about halfway up the perceptual scale. For details,
see Fig. 2 (6.3) in Wyszecki and Stiles,
Color Science
(cited on page 231).
The L* symbol is pronounced
EL-star.
Lightness (CIE L*)
In
Contrast sensitivity,
on page 198, I explained that
vision has a nonlinear perceptual response to lumi-
nance. Vision scientists have proposed many functions
that relate relative luminance
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Publisher Resources

ISBN: 9781558607927