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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 5-graduated counter current gray scales are arranged on a gray background (D=0.83), the gray scales being graduated logarithmically.
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Date:2017-07-07  Browse:
  • Introduction
  • Product Software

LOGARITHMIC GRAY SCALE TEST CHART

 

REFLECTANCE

 

Two 5-graduated counter current gray scales are arranged on a gray background (D=0.83), the

gray scales being graduated logarithmically. Related to the densities of the gray scales:

gamma= 0.45. Related to the remission values (brightness): gamma = 2.2, that being exactly the

reciprocal value of gamma = 0.45.


The signal of the background is in the middle of the 3 rd and the 4th step. The output of an optimally

gamma-corrected camera yields two 5-graduated counter current linear step signals. The contrast

range of the gray scales is 40: 1.


The values of the 5-graduated gray scale are as follows:

 

Step

Density

Reflectance in %

Output voltage in %

1

0.15

71

100

2

0.37

43

77.5

3

0.65

22

55

4

1.05

9

32.5

5

1.75

2

10

 


 

 

 

 

 

 

 

 

 

 

The density values are based on a density of BaO4S=0. A field of black velvet is located between

the gray scales. The density of this field is D > 2.4 (reflectance < 0.5 %).