Image Processing Reference
In-Depth Information
TABLE 8.3
Cyan TRC Function
d
TRC¼ f
1
(d)
0
0
42
25
66.68
50
81.37
75
104.97
100
120.57
125
138.71
150
173.68
175
197.14
200
221.99
225
255
255
250
f
(
d
)
TRC
45° Line
200
150
100
50
0
0
50
100
150
200
250
Digital input
C
FIGURE 8.4
Channel-independent cyan TRC.
8.5.2 G
RAY
-B
ALANCED
C
ALIBRATION
Recall that gray-balance calibration is performed (i.e., gray-balance TRCs for cyan,
magenta, and yellow channels are generated) to make the print engine produce
equivalent neutral gray accurately with equal amounts of CMY colors. That is,
after gray-balance calibration, an input with a digital count of
C
¼
M
¼
Y
¼
d
and
K
¼
0
(
8
:
4
)
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