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10 February 2005
Adjustment Reference For Gamma Correction
The following tables show the adjustment reference for gamma correction. The
tables show the level of the color scale on the C4 test chart and on the tone control
test sheet printed in the printer SP mode.
For example, for K at text mode, grade 12 on the tone control test sheet should be
the same as grade 7 on the C4 chart.
Normally, it is not necessary to adjust the gamma data as shown in the table since
ACC adjusts the gamma curve automatically. The fine-tuning of color balance by
gamma data adjustment will be required only when the result from ACC and Color
Calibration does not meet the customer's requirements.
C4 test chart
K
Text
Test
sheet
Photo/Graph
C4 test chart
C
Text
Test
sheet
Photo/Graph
C4 test chart
M
Text
Test
sheet
Photo/Graph
C4 test chart
Y
Text
Test
sheet
Photo/Graph
1
2
3
4
-
1
2
5
-
1
2
5
1
2
3
4
-
1
2
3
-
1
2
3
1
2
3
4
-
1
2
4
-
1
2
5
1
2
3
4
-
1
3
6
-
1
4
7
3-71
COLOR ADJUSTMENT
5
6
7
8
6
9
12
13
6
9
11
13
5
6
7
8
12/
4
7
9
10
5
8
9
11
5
6
7
8
5
7
10
12
6
9
11
13
5
6
7
8
12/
8
10
16
13
8
10
13
16
9
10
16
-
16
-
9
10
15
13
12
14
9
10
16
-
16
-
9
10
-
-
-
-
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