Image Processing Reference
In-Depth Information
6
L
*(
k
)-
L
target
a
*(
k
)-
a
target
b
*(
k
)-
b
target
4
2
0
-2
-4
-6
-8
-10
-12
0
2
4
6
8
10
12
Print number
k
FIGURE 8.13
Error e(k) with respect to iteration number, k.
12
10
8
6
4
2
0
0
2
4
6
8
10
12
k
FIGURE 8.14 D
E
a
*
(k) as a function of print number.
8.6.2 H
IGHLIGHT AND
S
HADOW
C
ORRECTIONS
The TRC has highlight and shadow regions. A highlight is a color or shade with a very
low digital value, indicating a region where very little toner
=
ink is deposited on the
paper. Given a 0
255 digital value range, highlights typically occur between 0 and 20.
A shadow is a color or shade with a very high digital value, typically above 230.
-
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