Image Processing Reference
In-Depth Information
Gloss vs. TMA,
T
= 140°C
55
50
45
40
35
30
25
20
1
1.5
2
2.5
3
3.5
4
TMA (mg/cm
3
)
FIGURE 10.28
Gloss vs. TMA for
xed temperature.
This section develops a comprehensive color predictive model that determines
the desired output based on scienti
c reason and principles. Physical parameters are
used as input and new-dependent physical parameters are the resulting output. This
color predictive model utilizes most of the main formulations of the well-known
Kubelka
Munk model [31], but it also provides an analytical approach to evaluate
the involved quantities based on an empirical set of equations whose parameters are
derived by
-
fitting models to experimental data. Hence, this color model considers
the re
ectance as a function of the toner masses (TMAs) for all four toner separations
(C, M, Y, K), which are, obviously, the most important parameters that determine the
output color. This model also follows the main assumption of Ref. [32], namely, that
the re
ectance is a function of gloss. Consequently, it contains a generalization of
these models, and simulations show that it performs reasonably well in predicting the
re
ectance of fused toner layer on paper for a large range of paper types.
The main equation of the re
ectance spectral model is
l)
R
s
(l)t
0
(
m
i
;
R
(
m
i
, g;
l) ¼
p
0
(
g
) þ [
1
p
1
(
n
1
, n
2
, i
)]t(
m
i
;
l)
(
10
:
54
)
where
m
i
are the masses of the four different toner layers used in printing, i
¼
1, 2, 3, 4,
that is, m
1
, m
2
, m
3
, m
4
for the masses of C, M, Y, K (m
C
, m
M
, m
Y
, m
K
,
respectively)
g is the surface gloss that is dependent on the masses as described by the fusing
model
R(m
i
, g;
), gloss (g),
the masses of different toner separations mi,
i
, and the measuring instrument
geometry
l
) is the output re
ectance as a function of wavelength (
l
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