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LOGARITHMIC GRAY SCALE TEST CHART
- Introduction
- Product Software
LOGARITHMIC GRAY SCALE TEST CHART
REFLECTANCE
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-graduated counter current linear step signals. The contrast range of the gray scale is 40:1.
The values of the 11-graduated gray scale are as follows:
|
Step |
Density |
Reflectance in % |
|
1 |
0.05 |
89 |
|
2 |
0.13 |
74 |
|
3 |
0.22 |
60 |
|
4 |
0.32 |
48 |
|
5 |
0.43 |
37 |
|
6 |
0.55 |
28 |
|
7 |
0.69 |
20 |
|
8 |
0.86 |
14 |
|
9 |
1.06 |
9 |
|
10 |
1.31 |
5 |
|
11 |
1.65 |
2 |
The density of the white field between the gray scale is D=0.05 (reflectance = 89%).
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