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

LOGARITHMIC GRAY SCALE TEST CHART

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).
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Date:2017-06-20  Browse:
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   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%).