Image Processing Reference
In-Depth Information
conditions. Many of the pro
le-induced image quality defects can be spotted easily
by performing soft proo
ng on a calibrated monitor. For example, by using Adobe
PhotoShop software or MATLAB image processing tool box, the blocking in hair
can be easily observed, which is a good example of not having proper black point
compensation.
Corn
e
rs = 255 255
0
0
Corn
er
s = 255 255
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
Corners = 255 0 0 255
Corn
e
rs = 25
5
0 0
2
55
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
From 0 to gamut corner
From 0 to gamut corner
Cor
n
ers =
0
255
0
255
Corn
e
rs = 0
255 0
255
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
0
20
40
60
80
100
120
(g)
From 0 to gamut corner
From 0 to gamut corner
FIGURE 7.65 (continued)
(g) CMYK response (left) and corresponding round trip accur-
acy (right) to blue, dark cyan, dark yellow corners from 50,0,0 point (
0
on x-axis corresponds
'
'
to 50,0,0 point).
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