Image Processing Reference
In-Depth Information
TABLE 6.20 (continued)
RGB to L*a*b*LUT
R
G
B
L*
a*
b*
85
255
0
88.61
67.23
84.23
85
255
85
88.92
64.93
65.85
85
255
170
89.97
57.46
28.1
85
255
255
91.92
44.7
12.85
170
0
0
35.22
61.11
49.62
170
0
85
36.48
62.31
2.06
170
0
170
40.4
66.13
44.77
170
0
255
46.7
72.46
83.55
170
85
0
45.76
34.03
54.99
170
85
85
46.64
36.13
16.31
170
85
170
49.47
42.53
30.43
170
85
255
54.32
52.39
71.13
170
170
0
67.51
9.43
69.75
170
170
85
67.99
7.17
43.39
170
170
170
69.61
0
0
170
170
255
72.56
11.78
42.12
170
255
0
91.69
44.69
87.97
170
255
85
91.98
42.89
70.02
170
255
170
92.97
37.03
32.66
26.77
8.23
170
255
255
94.82
255
0
0
53.4
82.8
67.51
255
0
85
54.1
83.46
28.96
255
0
170
56.39
85.66
18.59
255
0
255
60.42
89.61
60.66
255
85
0
59.8
65.61
70.2
255
85
85
60.38
66.56
36.76
255
85
170
62.33
69.67
9.63
255
85
255
65.81
75.07
52.08
255
170
0
76.14
27.14
79.82
255
170
85
76.54
28.41
55.45
255
170
170
77.88
32.55
12.96
255
170
255
80.35
39.79
29.43
255
255
0
97.15
12.78
94.51
255
255
85
97.42
11.53
77.34
255
255
170
98.31
7.41
40.71
255
255
255
100
0
0
(b) Using the moving-matrix technique,
find the RGB values corresponding to
¼
62].
6.10
(a) Using the RGB to L*a*b* LUT of Problem 6.9, estimate the Jacobian of
the transformation at the nominal value RGB
¼
L*a*b*
[60
82
[120
67
145] using
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