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You Are Here : Home >> Products >> Image test chart >> Grey Scale Card >> LOGARITHMIC GRAY SCALE TEST CHART 16:9

LOGARITHMIC GRAY SCALE TEST CHART 16:9

Two 9-graduated counter current gray scales are arranged on a gray background (D=0.75), the gray scales being graduated logarithmically.
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Date:2017-07-21  Browse:
  • Introduction
  • Product Software

LOGARITHMIC GRAY SCALE TEST CHART 16:9

 

REFLECTANCE


Two 9-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 reflection values (brightness): gamma = 2.2, that being exactly the reciprocal value

of gamma=0.45.


The output of an optimally gamma-corrected camera yields two 9-graduated counter current linear

step signals. The contrast range of the gray scales is 56:1.


The values of the 9-graduated gray scales are as follows:

Step

Density

Reflectance in %

Output signal in %

1

0.15

71

100

2

0.26

55

88.75

3

0.37

42

77.5

4

0.51

31

66.25

5

0.67

22

55

6

0.85

14

43.75

7

1.09

8

32.5

8

1.39

4

21.25

9

1.85

1.4

10


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The density values are based on a density of BaSO4 = 0. Two black fields and a white field

are located between the gray scales. The density of the black field is D > 2.4 (reflectance < 0.5 %).

The density of the white field is D = 0.05 (reflectance = 90%)