Two 11-graduated counter current gray scales are arranged on a gray background (D = 0.62), the gray scales being graduated logarithmically (gamma = 0.45). The output signal of an optimal gamma-corrected camera yields two 11-graduates counter current linear step signals. The contrast range of the gray scale is 40:1.
The values of the 11-graduated gray scales are as follows:
|
Step |
Density |
Transmission in % |
|
1 |
0.12 |
76 |
|
2 |
0.20 |
63 |
|
3 |
0.29 |
51 |
|
4 |
0.39 |
41 |
|
5 |
0.50 |
32 |
|
6 |
0.62 |
24 |
|
7 |
0.76 |
17 |
|
8 |
0.92 |
12 |
|
9 |
1.13 |
7 |
|
10 |
1.38 |
4 |
|
11 |
1.72 |
2 |
The density of the white field between the gray scale is D = 0.12 (transmission = 76%).
