Image Processing Reference
In-Depth Information
Find the range of parameter
m
that guarantees convergence of the ICI
algorithm.
6.9
Consider a scanner characterization color space transformation from a cali-
brated scanner RGB to a device-independent color space L*a*b* given by the
4-level (64 grid points) LUT shown in Table 6.20.
(a) Using trilinear interpolation,
find the L*a*b* values corresponding to the
following RGB values:
RGB1
¼ [
23
23
23
]
RGB2
¼ [
123
123
50
]
TABLE 6.20
RGB to L*a*b*LUT
R
G
B
L*
a*
b*
0
0
0
0
0
0
0
0
85
5.9
23.13
48.17
0
0
170
19.59
39.51
79.7
0
0
255
32.22
53.53
108
0
85
0
30.61
33.73
37.35
0
85
85
32.12
22.79
6.41
0
85
170
36.69
0.86
51.53
0
85
255
43.76
24.87
88.83
0
170
0
60.52
55.37
61.32
0
170
85
61.09
50.86
33.38
0
170
170
63
37.41
10.52
0
170
255
66.43
17.56
52.17
0
255
0
87.68
75.03
83.09
0
255
85
87.99
72.52
64.58
0
255
170
89.06
64.42
26.71
50.69
14.25
0
255
255
91.05
85
0
0
15.2
37.22
23.69
85
0
85
18.36
40.28
27.27
85
0
170
26.25
48.33
68.43
85
0
255
36.23
58.92
101.2
85
85
0
34.87
5.74
42.49
85
85
85
36.15
0
0
85
85
170
40.11
14.81
45.85
85
85
255
46.47
32.93
84.28
85
170
0
62.21
41.88
63.39
85
170
85
62.76
38.18
35.82
85
170
170
64.59
26.91
7.98
85
170
255
67.9
9.68
49.76
(continued)
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