Description
The YE 0223 is designed for evaluation of the halftone reproduction of electronic cameras. Two 13-graduated counter current gray scales are arranged on a gray background (D = 0.75), the gray scales being graduated logarithmically. Related to the densities of the gray scales: gamma = 0.45, related to the transmission values (brightness): gamma = 2.2, that being exactly the reciprocal value of gamma = 0.45. The output signal of a optimally gamma-corrected camera yields two 13-gratuated counter current linear step signals.
The contrast range of the gray scales is 200 : 1.
The values of the 11-graduated gray scale are as follows:
|
Step |
Density |
Reflectance in % |
|
1 |
0.05 |
89 |
|
2 |
0.13 |
74 |
|
3 |
0.21 |
62 |
|
4 |
0.30 |
50 |
|
5 |
0.40 |
40 |
|
6 |
0.51 |
31 |
|
7 |
0.63 |
23 |
|
8 |
0.78 |
17 |
|
9 |
0.95 |
11 |
|
10 |
1.15 |
7 |
|
11 |
1.41 |
4 |
|
12 |
1.77 |
2 |
|
13 |
2.35 |
0.5 |
The density of the white field between the gray scale is D = 0.05 (reflectance = 89 %).
