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Image Processing for Cinema
book

Image Processing for Cinema

by Marcelo Bertalmío
February 2014
Intermediate to advanced content levelIntermediate to advanced
321 pages
10h 26m
English
Chapman and Hall/CRC
Content preview from Image Processing for Cinema
72 Image Processing for Cinema
S(λ
R
) =
R
I(λ
R
)
, S(λ
G
) =
G
I(λ
G
)
, S(λ
B
) =
B
I(λ
B
)
. (3.6)
The white balance process by which a color corrected triplet (R
0
, G
0
, B
0
)
is obtained from (R, G, B) can be written in matrix form thus:
R
0
G
0
B
0
=
1
I(λ
R
)
0 0
0
1
I(λ
G
)
0
0 0
1
I(λ
B
)
R
G
B
. (3.7)
Some cameras proceed this way although it is usually preferred to apply
the diagonal model of Equation 3.5 not directly on the RGB values but on
their correspondent cone tristimulus values, since color adaptation in the eye
is very much dependent on the sensitivity of the cones [205]. We can convert
RGB values into CIE tristimulus values XY Z with:
X
Y
Z
= A
R
G
B
, (3.8)
where
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Publisher Resources

ISBN: 9781439899274