Image Processing Reference
In-Depth Information
250
250
200
200
Cyan
Magenta
Yellow
Black
Cyan
Magenta
Yellow
Black
150
150
100
100
50
50
0
0
0
50
100
150
200
250
0
50
100
150
200
250
<----Black
R=G=B 8 bit input (
a
*=
b
*=0)
White--->
<----Black
R = G = B 8 bit input (
a
*=
b
*=0)
White---->
FIGURE 7.33
GCR response to neutral RGB sweep (left: with MM inversion; right: control-
based inversion).
100
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
sRGB input
L
* along
a
*=
b
*=0
sRGB input
L
* along
a
*=
b
*=0
FIGURE 7.34
Input L* vs. output L* response (left: with MM inversion; right: control-
based inversion).
2200
2200
2000
2000
1800
1800
1600
Max
Δ
E
*
b
1600
Max
Δ
E
*
b
53.8953
25.2948
1400
1400
Avg
Δ
E
*
b
Avg
Δ
E
*
b
8.2994
1200
1200
3.9398
1000
1000
800
800
600
600
400
400
200
200
0
0
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
Color difference
Δ
E
*
b
Color difference
Δ
E
*
b
Histogram of roundtrip accuracy shown in terms of
D
E
ab
FIGURE 7.35
(left: with MM
inversion; right: control-based inversion).
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