HDTV Gray Scale Test Chart
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 t...
Introduction
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 %).
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