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You Are Here : Home >> Products >> Image test chart >> Grey Scale Card >> 11-STEP GRAY SCALE TEST CHART

11-STEP GRAY SCALE TEST CHART

Two 11-graduated counter current gray scales are arranged on a gray background (D ≈ 0.56), the gray scale corresponds to the ITU recommendation BT.709.
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Date:2017-08-14  Browse:
  • Introduction
  • Product Software

11-STEP GRAY SCALE TEST CHART 16:9 / BT.709

 

                                               REFLECTIVE

 

Two 11-graduated counter current gray scales are arranged on a gray background

(D ≈ 0.56), the gray scale corresponds to the ITU recommendation BT.709.


The output signal of an optimally gamma-corrected camera according to BT.709 generates

two 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

Remission

Video signal

Video signal



in %

for BT.709

for gamma 0.45




in %

in %

1

0.05

89

100

100

2

0.13

74

91

92

3

0.22

60

82

84

4

0.32

48

73

75

5

0.43

37

64

67

6

0.56

28

55

59

7

0.70

20

46

51

8

0.88

13

37

43

9

1.08

8

28

35

10

1.34

5

19

26

11

1.64*

2

11

19


*The production process for reflective charts allow a maximum printed density of 1.64.

The target value for the darkest step is 1.70. Therefore the distance of the last step differ slightly.


Two black fields and a white field are located between the gray scales. The density of the

black fields in the middle is D > 3 (remission < 0.1 %), the white field between has a density

of 0.05 (remission 89.9%).


Recommended usage:

Adjust the aperture until the lightest patch reaches 100% video signal at the waveform

monitor. With an optimally corrected camera according to ITU recommendation BT.709

the darkest patch will reach 10% signal level.


When using this chart with a gamma correction of 0.45 the video signal level for each

step will change as listed in the table above.