Image Processing Reference
In-Depth Information
corner point {L
c
a
c
b
c
} shown by Equations 7.95 and 7.96. For the purpose of
drawing corner plots, in Equation 7.95, when i
¼
0 the line will start at x
¼
x
0
. When
i
¼
i¼N, the line will intersect the gamut corner point {L
c
a
c
b
c
}. Note that when the
line stimulus is given between {100,0,0} and the dark corner {0,0,0}, the corner plot
shows the neutral response of the inversion algorithm (Figure 7.66). Clearly, the
round trip accuracy corner plots from (50,0,0) show lower accuracy numbers as
compared with similar corner plots from (100,0,0) point.
Co
r
ner
s
= 2
5
5
0
0
0
C
o
rn
er
s =
2
55
0
0
0
250
8
K
C
M
Y
7
200
6
5
150
4
100
3
2
50
1
0
0
0
20
40
60
80
100 120 140 160 180
0
20
40
60
80
100 120 140 160 180
From 0 to gamut corner
From 0 to gamut corner
Cor
n
ers = 0 255
0 0
Corners = 0 255
0 0
250
8
K
C
M
Y
7
200
6
5
150
4
100
3
2
50
1
0
0
0
50
100
150
0
50
100
150
From 0 to gamut corner
From 0 to gamut corner
Corn
e
rs = 0
0 255
0
Corn
e
rs = 0
0 255
0
250
8
K
C
M
Y
7
200
6
5
150
4
100
3
2
50
1
0
0
0
20
40
60
80
100
0
20
40
60
80
100
(a)
From 0 to gamut corner
From 0 to gamut corner
FIGURE 7.65
(a) CMYK response (left) and corresponding round trip accuracy (right) to
cyan, magenta, yellow corners from 100,0,0 point (
'
0
'
on x-axis corresponds to 100,0,0 point).
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